-
Notifications
You must be signed in to change notification settings - Fork 7
/
movegen_test.go
544 lines (517 loc) · 25.5 KB
/
movegen_test.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
package dragontoothmg
import (
"fmt"
"math/bits"
"testing"
)
func TestPawnPushes(t *testing.T) {
positions := map[string]int{
"rnbqkbnr/ppp2pp1/3p4/4p3/3N1P2/P1n5/2PPP3/R1BQKBNR w KQkq - 0 0": 5,
"rnbqkbnr/ppp2pp1/3p4/4p3/3N1P2/P1n5/2PPP3/R1BQKBNR b KQkq - 0 0": 12,
}
for k, v := range positions {
moves := make([]Move, 0, 45)
b := ParseFen(k)
b.pawnPushes(&moves, everything, everything)
if len(moves) != v {
t.Error("Pawn pushes: wrong length. Expected", v, "but got",
len(moves), "for FEN", b.ToFen())
}
}
}
func TestPawnCaptures(t *testing.T) {
positions := map[string]int{
"rnbqkbnr/ppp2pp1/3p4/4p3/3N1P2/P1n5/2PPP3/R1BQKBNR w KQkq - 0 0": 2,
"rnbqkbnr/ppp2pp1/3p4/4p3/3N1P2/P1n5/2PPP3/R1BQKBNR b KQkq - 0 0": 2,
"rnbqkbnr/ppp2pp1/3p4/4pP2/3N4/P1n5/2PPP3/R1BQKBNR w KQkq e6 0 0": 2,
}
for k, v := range positions {
moves := make([]Move, 0, 45)
b := ParseFen(k)
b.pawnCaptures(&moves, everything, everything)
if len(moves) != v {
t.Error("Pawn captures: wrong length. Expected", v, "but got",
len(moves), "for FEN", b.ToFen())
}
}
}
func TestKnightPosition0(t *testing.T) {
// Board setup:
// WN 57 WN 59 60 61 WN 63 W: 2, 4, 3
// 48 49 50 51 52 53 WN 55 W: 4
// 40 BN 42 BP 44 45 46 47 B: 5
// 32 33 WN 35 36 BN 38 39 W: 7 B: 7
// BN 25 26 27 28 29 30 31 B: 3
// 16 WP 18 BN 20 21 22 23 B: 8
// 8 9 10 11 12 13 BN 15 B: 4
// 0 1 2 3 4 5 6 7
var whitePawns uint64 = 1 << 17
var blackPawns uint64 = 1 << 43
// 0100010101000000000000000000010000000000000000000000000000000000
var whiteKnights uint64 = 0x4540000400000000
// 0000000000000000000000100010000000000001000010000100000000000000
var blackKnights uint64 = 0x22001084000
whitepieces := Bitboards{Pawns: whitePawns, Knights: whiteKnights, All: whitePawns | whiteKnights}
blackpieces := Bitboards{Pawns: blackPawns, Knights: blackKnights, All: blackPawns | blackKnights}
testboard := Board{White: whitepieces, Black: blackpieces, Wtomove: true}
moves := make([]Move, 0, 45)
testboard.knightMoves(&moves, everything, everything)
if len(moves) != 20 {
t.Error("Knight moves: wrong length. Expected 20, got", len(moves))
}
testboard.Wtomove = false
moves2 := make([]Move, 0, 45)
testboard.knightMoves(&moves2, everything, everything)
if len(moves2) != 27 {
t.Error("Knight moves: wrong length. Expected 27, got", len(moves2))
}
}
func TestKingPositions(t *testing.T) {
positions := map[string]int{
"1Q2rk2/2p2p2/1n4b1/N7/2B1Pp1q/2B4P/1QPP1P2/4K2R b K e3 4 30": 2,
"1Q2rk2/2p2p2/1n4b1/N7/2B1Pp1q/2B4P/1QPP1P2/4K2R w K e3 4 30": 4,
"r3k2r/7B/8/8/3q4/8/P6P/R3K2R w KQkq - 0 0": 2,
"r3k2r/7B/8/8/3q4/8/P6P/R3K2R b KQkq - 0 0": 6,
"8/1pk5/8/8/8/2R4b/8/4K2R w K -": 4,
"8/1pk5/8/8/7b/2R5/8/4K2R b K - 0 0": 5,
"4k3/8/8/8/8/8/8/4K2R w K - 0 0": 6, // white short castle
"4k3/8/8/8/8/8/8/4K1NR w K - 0 0": 5, // short castle blocked
}
for k, v := range positions {
moves := make([]Move, 0, 45)
b := ParseFen(k)
b.kingMoves(&moves)
if len(moves) != v {
t.Error("King moves: wrong length. Expected", v, "but got",
len(moves), "\nFor position:", k)
}
}
}
func TestRookPositions(t *testing.T) {
positions := map[string]int{
"rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq -": 0,
"rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR b KQkq -": 0,
"rnbqkbnr/ppppppp1/8/8/7R/8/1PPPPPPP/RNBQKBNR w KQkq -": 18,
"rnbqkbnr/ppppppp1/8/8/7R/8/1PPPPPPP/RNBQKBNR b KQkq -": 4,
"r1N2bnN/3pp1p1/8/2rR4/7R/8/1PP1P1P1/RN5R w KQkq -": 37,
"r1N2bnN/3pp1p1/8/2rR4/7R/8/1PP1P1P1/RN5R b KQkq -": 18,
"8/8/8/3r4/8/8/8/8 w KQkq -": 0,
"8/8/8/3r4/8/8/8/8 b KQkq -": 14,
}
for k, v := range positions {
moves := make([]Move, 0, 45)
b := ParseFen(k)
b.rookMoves(&moves, everything, everything)
if len(moves) != v {
t.Error("Rook moves: wrong length. Expected", v, "but got", len(moves))
}
}
}
func TestBishopPositions(t *testing.T) {
positions := map[string]int{
"rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq -": 0,
"rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR b KQkq -": 0,
"rnbqkb1r/pp2pppp/8/4P3/5bN1/8/PPP2PPP/RNBQKBNR w KQkq -": 8,
"rnbqkb1r/pp2pppp/8/4P3/5bN1/8/PPP2PPP/RNBQKBNR b KQkq -": 12,
}
for k, v := range positions {
moves := make([]Move, 0, 45)
b := ParseFen(k)
b.bishopMoves(&moves, everything, everything)
if len(moves) != v {
t.Error("Bishop moves: wrong length. Expected", v, "but got", len(moves))
}
}
}
func TestQueenPositions(t *testing.T) {
positions := map[string]int{
"rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq -": 0,
"rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR b KQkq -": 0,
"6nq/6p1/2B4n/1rB2r1R/5q2/2P5/1Q4n1/2B5 w - -": 12,
"6nq/6p1/2B4n/1rB2r1R/5q2/2P5/1Q4n1/2B5 b - -": 21,
}
for k, v := range positions {
moves := make([]Move, 0, 45)
b := ParseFen(k)
b.queenMoves(&moves, everything, everything)
if len(moves) != v {
t.Error("Queen moves: wrong length. Expected", v, "but got", len(moves))
}
}
}
func TestUnderDirectAttack(t *testing.T) {
b1 := ParseFen("r1N1kbnN/3pp1p1/1p2q3/2rR1b2/2QP1nBR/6B1/1PP1P1P1/RNK4R b - - 0 0")
solutionsByBlack := map[uint8]bool{
algebraicToIndexFatal("a5"): true,
algebraicToIndexFatal("a7"): true,
algebraicToIndexFatal("d8"): true,
algebraicToIndexFatal("f7"): true,
algebraicToIndexFatal("h7"): true,
algebraicToIndexFatal("h6"): true,
algebraicToIndexFatal("d8"): true,
algebraicToIndexFatal("e2"): true,
algebraicToIndexFatal("f5"): true,
algebraicToIndexFatal("b5"): true,
algebraicToIndexFatal("d1"): false,
algebraicToIndexFatal("g5"): false,
algebraicToIndexFatal("b7"): false,
}
for k, v := range solutionsByBlack {
attacked := b1.UnderDirectAttack(true, k)
if attacked != v {
t.Error("Under attack failed for position", b1.ToFen(), "\nat coord ", IndexToAlgebraic(Square(k)))
}
}
b2 := ParseFen("r1N1kbnN/3pp3/1p2q3/2rR1bpP/2QP1nBR/6B1/1PP1P1P1/RNK4R b - g6 0 0")
solutionsByWhite := map[uint8]bool{
algebraicToIndexFatal("c2"): true, // TODO(dylhunn): this case is dubious
algebraicToIndexFatal("b3"): true,
algebraicToIndexFatal("b5"): true,
algebraicToIndexFatal("b6"): true,
algebraicToIndexFatal("g6"): true,
algebraicToIndexFatal("g8"): false,
algebraicToIndexFatal("e6"): false,
algebraicToIndexFatal("e8"): false,
}
for k, v := range solutionsByWhite {
attacked := b2.UnderDirectAttack(false, k)
if attacked != v {
t.Error("Under attack failed for position", b2.ToFen(), "\nat coord ", IndexToAlgebraic(Square(k)))
}
}
}
// Test that the only legal moves are those that break check, through:
// - moving the king
// - capture the checking piece
// - breaking the check
func TestBreakCheck(t *testing.T) {
positions := map[string]int{
"k1N5/3RrQ2/8/2B4R/8/2N5/8/4K3 w - - 0 0": 13, // Non-pawn check-breaks and captures
"8/8/1p2p3/R6k/8/8/8/K7 b - - 0 0": 7, // breaks and captures with a pawn
"3k4/2P4r/1P6/8/8/8/8/K7 b - - 0 0": 5, // break the check of a pawn
"3k4/2P1P3/1P6/8/8/8/8/K7 b - - 0 0": 4, // double check with pawns: must move king
"3k4/7r/1P6/8/7B/8/3R4/K7 b - - 0 0": 2, // double check: must move king
"8/8/8/1k6/2Pp4/8/8/4K3 b - c3 0 0": 9, // en passant check evasion
"8/8/8/1k6/3Pp3/8/8/K4Q2 b - d3 0 0": 6, // en passant check evasion
}
for k, v := range positions {
b := ParseFen(k)
moves := b.GenerateLegalMoves()
if len(moves) != v {
t.Error("Legal moves breaking check: wrong length. Expected", v, "but got", len(moves), "for position", b.ToFen())
}
}
}
// Test that pinned pieces can only move along the pin ray
func TestPinnedBishop(t *testing.T) {
positions := map[string]int{
"4k3/3b4/8/8/Q7/8/8/4K3 b - - 0 0": 3, // pinned bishop
"4k3/3b4/2b5/8/Q7/8/8/4K3 b - - 0 0": 0, // a "double" pin is not actually a pin
"4k3/3b1b2/2Q3Q1/8/8/8/8/4K3 b - - 0 0": 2, // two close pins
}
for k, v := range positions {
moves := make([]Move, 0, 45)
b := ParseFen(k)
b.generatePinnedMoves(&moves, everything)
if len(moves) != v {
t.Error("Legal moves for pinned bishops: wrong length. Expected", v, "but got", len(moves), "for position", b.ToFen())
}
}
}
func TestPinnedKnight(t *testing.T) {
positions := map[string]int{
"4k3/3n1n2/2Q3Q1/8/8/8/8/4K3 b - - 0 0": 0, // two close pins
"4k3/8/8/8/1q6/2N5/8/4K3 w - - 0 0": 0, // normal pin
}
for k, v := range positions {
moves := make([]Move, 0, 45)
b := ParseFen(k)
b.generatePinnedMoves(&moves, everything)
if len(moves) != v {
t.Error("Legal moves for pinned bishops: wrong length. Expected", v, "but got", len(moves), "for position", b.ToFen())
}
}
}
func TestPinnedQueen(t *testing.T) {
positions := map[string]int{
"4k3/8/8/8/1q6/2Q5/8/4K3 w - - 0 0": 2, // normal pin
"4k3/8/4r3/4Q3/1q6/2Q5/8/4K3 w - - 0 0": 6,
}
for k, v := range positions {
moves := make([]Move, 0, 45)
b := ParseFen(k)
b.generatePinnedMoves(&moves, everything)
if len(moves) != v {
t.Error("Legal moves for pinned bishops: wrong length. Expected", v, "but got", len(moves), "for position", b.ToFen())
}
}
}
func TestDiagPins(t *testing.T) {
positions := map[string]int{
"4k3/3p4/2B1p3/8/1q6/4R3/3P4/4K3 w - - 0 0": 0, // diagonal pawns
"4k3/3p4/2B1p3/8/1q6/4R3/3P4/4K3 b - - 0 0": 2,
"4k3/8/8/8/1q6/2Q5/8/4K3 w - - 0 0": 2, // normal queen pin
"4k3/8/4r3/4Q3/1q6/2Q5/8/4K3 w - - 0 0": 6,
"4k3/8/2p5/8/B7/6q1/5N2/4K3 w - - 0 0": 0,
"4k3/8/2p5/8/B7/6q1/5N2/4K3 b - - 0 0": 0,
"4k3/8/6p1/3b3Q/2P5/1K6/8/8 w - - 0 0": 1,
"4k3/8/6p1/3b3Q/2P5/1K6/8/8 b - - 0 0": 1,
"4k3/8/8/b7/7q/6P1/8/4K3 w - - 0 0": 1, // tet pin while in check
}
pinLocs := map[string]uint8{
"4k3/3p4/2B1p3/8/1q6/4R3/3P4/4K3 w - - 0 0": algebraicToIndexFatal("d2"), // diagonal pawns
"4k3/3p4/2B1p3/8/1q6/4R3/3P4/4K3 b - - 0 0": algebraicToIndexFatal("e6"),
"4k3/8/8/8/1q6/2Q5/8/4K3 w - - 0 0": algebraicToIndexFatal("c3"),
"4k3/8/4r3/4Q3/1q6/2Q5/8/4K3 w - - 0 0": algebraicToIndexFatal("c3"), // TODO: only checks one of two pins
"4k3/8/2p5/8/B7/6q1/5N2/4K3 w - - 0 0": algebraicToIndexFatal("f2"),
"4k3/8/2p5/8/B7/6q1/5N2/4K3 b - - 0 0": algebraicToIndexFatal("c6"),
"4k3/8/6p1/3b3Q/2P5/1K6/8/8 w - - 0 0": algebraicToIndexFatal("c4"),
"4k3/8/6p1/3b3Q/2P5/1K6/8/8 b - - 0 0": algebraicToIndexFatal("g6"),
"4k3/8/8/b7/7q/6P1/8/4K3 w - - 0 0": algebraicToIndexFatal("g3"),
}
for k, v := range positions {
moves := make([]Move, 0, 45)
b := ParseFen(k)
result := b.generatePinnedMoves(&moves, everything)
if len(moves) != v {
t.Error("Legal moves for diagonal pins: wrong length. Expected", v, "but got", len(moves), "for position", b.ToFen())
}
if pinLocs[k] == 64 {
if result != 0 {
t.Error("Found a false pin")
}
} else if pinLocs[k] != uint8(bits.TrailingZeros64(result)) {
t.Error("Wrong pinned location for ", b.ToFen(), ":",
IndexToAlgebraic(Square(bits.TrailingZeros64(result))),
"not", IndexToAlgebraic(Square(pinLocs[k])))
}
}
}
func TestTrickyCornerCases(t *testing.T) {
positions := map[string]int{
"8/8/8/8/k1Pp3Q/8/8/2K5 b - c3 0 0": 5, // e.p. capture into check
"8/8/8/8/1kPp4/8/8/2K1B3 b - c3 0 0": 6, // e.p. breaks check
}
for k, v := range positions {
b := ParseFen(k)
fenbefore := b.ToFen()
moves := b.GenerateLegalMoves()
fenafter := b.ToFen()
if fenbefore != fenafter {
t.Error("En passant case corrupted board state.")
}
if len(moves) != v {
t.Error("Tricky moves: wrong length. Expected", v, "but got", len(moves), "for position", b.ToFen())
}
}
}
func TestOrthoPins(t *testing.T) {
positions := map[string]int{
"4k3/8/4r3/4Q3/1q6/2Q5/8/4K3 b - - 0 0": 2,
"7k/8/8/8/1r2R3/8/8/4K3 w - - 0 0": 0, // "false pin"
"7k/8/8/8/1r2R3/8/8/4K3 b - - 0 0": 0, // no pin at all
"3k4/8/3n4/8/8/8/3Q4/7K b - - 0 0": 0, // knight pin
"8/8/1r3QK1/3QQ3/8/kr6/8/8 w - - 0 0": 4, // queen pin
"4k3/4p3/8/8/8/4R3/q2PK3/8 w - - 0 0": 0, // horizontal pawn*/
"4k3/4p3/8/8/8/4R3/q2PK3/8 b - - 0 0": 2,
"8/4k3/8/4p3/8/4R3/q2PK3/8 b - - 0 0": 1,
"2q1k3/8/2R5/8/2K4r/8/8/8 w - - 0 0": 3, // test pin while in check
"rnbqkbnr/ppp1pppp/4Q3/8/4p3/8/PPPP1PPP/RNB1KBNR b KQkq - 0 3": 0, // pawn is pinned
}
pinLocs := map[string]uint8{
"4k3/8/4r3/4Q3/1q6/2Q5/8/4K3 b - - 0 0": algebraicToIndexFatal("e6"),
"7k/8/8/8/1r2R3/8/8/4K3 w - - 0 0": 64, // "false pin"
"7k/8/8/8/1r2R3/8/8/4K3 b - - 0 0": 64, // no pin at all
"3k4/8/3n4/8/8/8/3Q4/7K b - - 0 0": algebraicToIndexFatal("d6"),
"8/8/1r3QK1/3QQ3/8/kr6/8/8 w - - 0 0": algebraicToIndexFatal("f6"),
"4k3/4p3/8/8/8/4R3/q2PK3/8 w - - 0 0": algebraicToIndexFatal("d2"), // horizontal
"4k3/4p3/8/8/8/4R3/q2PK3/8 b - - 0 0": algebraicToIndexFatal("e7"),
"8/4k3/8/4p3/8/4R3/q2PK3/8 b - - 0 0": algebraicToIndexFatal("e5"),
"2q1k3/8/2R5/8/2K4r/8/8/8 w - - 0 0": algebraicToIndexFatal("c6"),
"rnbqkbnr/ppp1pppp/4Q3/8/4p3/8/PPPP1PPP/RNB1KBNR b KQkq - 0 3": algebraicToIndexFatal("e7"), // pawn is pinned with double pawn in file
}
for k, v := range positions {
moves := make([]Move, 0, 45)
b := ParseFen(k)
result := b.generatePinnedMoves(&moves, everything)
if len(moves) != v {
t.Error("Legal moves for orthogonal pins: wrong length. Expected", v, "but got", len(moves), "for position", b.ToFen())
printMoves(moves)
}
if pinLocs[k] == 64 {
if result != 0 {
t.Error("Found a false pin")
}
} else if pinLocs[k] != uint8(bits.TrailingZeros64(result)) {
t.Error("Wrong pinned location")
}
}
}
func TestCountAttacks(t *testing.T) {
b := ParseFen("3B4/8/1k4Rq/P1pP1P2/8/2p5/3K3r/1n2b3 w - c6 0 0")
b2 := ParseFen("3B4/8/1k4Rq/P1pP1P2/8/2p5/3K3r/1n2b3 b - - 0 0")
numAttacks, blockerDestinations := b.countAttacks(
true, algebraicToIndexFatal("d2"), 1000) // on white king
numAttacks2, blockerDestinations2 := b2.countAttacks(
false, algebraicToIndexFatal("b6"), 1000)
if numAttacks != 5 || numAttacks2 != 3 ||
blockerDestinations != 0x80402014F012 || blockerDestinations2 != 0x8047C0100000000 {
t.Error("Attack counting failed.")
}
}
func testBugCases(t *testing.T) {
b := ParseFen("r3k2r/p1ppqpb1/bn2pnp1/3PN3/4P3/1pN2Q1p/PPPBBPPP/R4RK1 w kq - 0 2")
moves := b.GenerateLegalMoves()
for i, v := range moves {
fmt.Println(i, &v)
}
fmt.Println(len(moves), "moves")
}
// An incomplete, yet giant, test suite of positions. Tests legal move generation.
func TestLegalMoves(t *testing.T) {
positions := map[string]int{
"5k1R/5p2/5P2/8/8/2r5/2rR2K1/4B3 b - - 0 1": 0, // checkmate
"nqn5/P1Pk4/8/8/8/6K1/7p/5N2 w - - 0 0": 19, // double promotion on the same square; capture to release a pin
"r3k2r/p1ppqpb1/1n2pnp1/1b1PN3/4P3/p1N2Q1p/1PPBBPPP/R4RK1 w kq - 0 0": 50, // spooky action bug (missing g1h1)
"r3k2r/Pppp1ppp/1b3nbN/1PP5/BB2P3/qP3N2/1p1P2PP/R2Q1RK1 b kq - 0 0": 38, // buggy double capture position
"r3k2r/p1ppqpb1/bn2pnp1/3PN3/4P3/1pN2Q1p/PPPBBPPP/R4RK1 w kq - 0 2": 49, // buggy rook move gen position, soln verified with stockfish
"rnbq1bnr/pppppkpp/5p2/8/2B5/4PQ2/PPPP1PPP/RNB1K1NR b KQkq - 0 0": 4, // pinned while in check; pinned piece can't move
"rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1": 20,
"r3k2r/p1ppqpb1/bn2pnp1/3PN3/1p2P3/2N2Q1p/PPPBBPPP/R3K2R w KQkq - 0 1": 48,
"4k3/8/8/8/8/8/8/4K2R w K - 0 1": 15,
"4k3/8/8/8/8/8/8/R3K3 w Q - 0 1": 16,
"4k2r/8/8/8/8/8/8/4K3 w k - 0 1": 5,
"r3k3/8/8/8/8/8/8/4K3 w q - 0 1": 5,
"4k3/8/8/8/8/8/8/R3K2R w KQ - 0 1": 26,
"r3k2r/8/8/8/8/8/8/4K3 w kq - 0 1": 5,
"8/8/8/8/8/8/6k1/4K2R w K - 0 1": 12,
"8/8/8/8/8/8/1k6/R3K3 w Q - 0 1": 15,
"4k2r/6K1/8/8/8/8/8/8 w k - 0 1": 3,
"r3k3/1K6/8/8/8/8/8/8 w q - 0 1": 4,
"r3k2r/8/8/8/8/8/8/R3K2R w KQkq - 0 1": 26,
"r3k2r/8/8/8/8/8/8/1R2K2R w Kkq - 0 1": 25,
"r3k2r/8/8/8/8/8/8/2R1K2R w Kkq - 0 1": 25,
"r3k2r/8/8/8/8/8/8/R3K1R1 w Qkq - 0 1": 25,
"1r2k2r/8/8/8/8/8/8/R3K2R w KQk - 0 1": 26,
"2r1k2r/8/8/8/8/8/8/R3K2R w KQk - 0 1": 25,
"r3k1r1/8/8/8/8/8/8/R3K2R w KQq - 0 1": 25,
"4k3/8/8/8/8/8/8/4K2R b K - 0 1": 5,
"4k3/8/8/8/8/8/8/R3K3 b Q - 0 1": 5,
"4k2r/8/8/8/8/8/8/4K3 b k - 0 1": 15,
"r3k3/8/8/8/8/8/8/4K3 b q - 0 1": 16,
"4k3/8/8/8/8/8/8/R3K2R b KQ - 0 1": 5,
"r3k2r/8/8/8/8/8/8/4K3 b kq - 0 1": 26,
"8/8/8/8/8/8/6k1/4K2R b K - 0 1": 3,
"8/8/8/8/8/8/1k6/R3K3 b Q - 0 1": 4,
"4k2r/6K1/8/8/8/8/8/8 b k - 0 1": 12,
"r3k3/1K6/8/8/8/8/8/8 b q - 0 1": 15,
"r3k2r/8/8/8/8/8/8/R3K2R b KQkq - 0 1": 26,
"r3k2r/8/8/8/8/8/8/1R2K2R b Kkq - 0 1": 26,
"r3k2r/8/8/8/8/8/8/2R1K2R b Kkq - 0 1": 25,
"r3k2r/8/8/8/8/8/8/R3K1R1 b Qkq - 0 1": 25,
"1r2k2r/8/8/8/8/8/8/R3K2R b KQk - 0 1": 25,
"2r1k2r/8/8/8/8/8/8/R3K2R b KQk - 0 1": 25,
"r3k1r1/8/8/8/8/8/8/R3K2R b KQq - 0 1": 25,
"8/1n4N1/2k5/8/8/5K2/1N4n1/8 w - - 0 1": 14,
"8/1k6/8/5N2/8/4n3/8/2K5 w - - 0 1": 11,
"8/8/4k3/3Nn3/3nN3/4K3/8/8 w - - 0 1": 19,
"K7/8/2n5/1n6/8/8/8/k6N w - - 0 1": 3,
"k7/8/2N5/1N6/8/8/8/K6n w - - 0 1": 17,
"8/1n4N1/2k5/8/8/5K2/1N4n1/8 b - - 0 1": 15,
"8/1k6/8/5N2/8/4n3/8/2K5 b - - 0 1": 16,
"8/8/3K4/3Nn3/3nN3/4k3/8/8 b - - 0 1": 4,
"K7/8/2n5/1n6/8/8/8/k6N b - - 0 1": 17,
"k7/8/2N5/1N6/8/8/8/K6n b - - 0 1": 3,
"B6b/8/8/8/2K5/4k3/8/b6B w - - 0 1": 17,
"8/8/1B6/7b/7k/8/2B1b3/7K w - - 0 1": 21,
"k7/B7/1B6/1B6/8/8/8/K6b w - - 0 1": 21,
"K7/b7/1b6/1b6/8/8/8/k6B w - - 0 1": 7,
"B6b/8/8/8/2K5/5k2/8/b6B b - - 0 1": 6,
"8/8/1B6/7b/7k/8/2B1b3/7K b - - 0 1": 17,
"k7/B7/1B6/1B6/8/8/8/K6b b - - 0 1": 7,
"K7/b7/1b6/1b6/8/8/8/k6B b - - 0 1": 21,
"7k/RR6/8/8/8/8/rr6/7K w - - 0 1": 19,
"R6r/8/8/2K5/5k2/8/8/r6R w - - 0 1": 36,
"7k/RR6/8/8/8/8/rr6/7K b - - 0 1": 19,
"R6r/8/8/2K5/5k2/8/8/r6R b - - 0 1": 36,
"6kq/8/8/8/8/8/8/7K w - - 0 1": 2,
"K7/8/8/3Q4/4q3/8/8/7k w - - 0 1": 6,
"6qk/8/8/8/8/8/8/7K b - - 0 1": 22,
"6KQ/8/8/8/8/8/8/7k b - - 0 1": 2,
"K7/8/8/3Q4/4q3/8/8/7k b - - 0 1": 6,
"8/8/8/8/8/K7/P7/k7 w - - 0 1": 3,
"8/8/8/8/8/7K/7P/7k w - - 0 1": 3,
"K7/p7/k7/8/8/8/8/8 w - - 0 1": 1,
"7K/7p/7k/8/8/8/8/8 w - - 0 1": 1,
"8/2k1p3/3pP3/3P2K1/8/8/8/8 w - - 0 1": 7,
"8/8/8/8/8/K7/P7/k7 b - - 0 1": 1,
"8/8/8/8/8/7K/7P/7k b - - 0 1": 1,
"K7/p7/k7/8/8/8/8/8 b - - 0 1": 3,
"7K/7p/7k/8/8/8/8/8 b - - 0 1": 3,
"8/2k1p3/3pP3/3P2K1/8/8/8/8 b - - 0 1": 5,
"8/8/8/8/8/4k3/4P3/4K3 w - - 0 1": 2,
"4k3/4p3/4K3/8/8/8/8/8 b - - 0 1": 2,
"8/8/7k/7p/7P/7K/8/8 w - - 0 1": 3,
"8/8/k7/p7/P7/K7/8/8 w - - 0 1": 3,
"8/8/3k4/3p4/3P4/3K4/8/8 w - - 0 1": 5,
"8/3k4/3p4/8/3P4/3K4/8/8 w - - 0 1": 8,
"8/8/3k4/3p4/8/3P4/3K4/8 w - - 0 1": 8,
"k7/8/3p4/8/3P4/8/8/7K w - - 0 1": 4,
"8/8/7k/7p/7P/7K/8/8 b - - 0 1": 3,
"8/8/k7/p7/P7/K7/8/8 b - - 0 1": 3,
"8/8/3k4/3p4/3P4/3K4/8/8 b - - 0 1": 5,
"8/3k4/3p4/8/3P4/3K4/8/8 b - - 0 1": 8,
"8/8/3k4/3p4/8/3P4/3K4/8 b - - 0 1": 8,
"k7/8/3p4/8/3P4/8/8/7K b - - 0 1": 4,
"7k/3p4/8/8/3P4/8/8/K7 w - - 0 1": 4,
"7k/8/8/3p4/8/8/3P4/K7 w - - 0 1": 5,
"k7/8/8/7p/6P1/8/8/K7 w - - 0 1": 5,
"k7/8/7p/8/8/6P1/8/K7 w - - 0 1": 4,
"k7/8/8/6p1/7P/8/8/K7 w - - 0 1": 5,
"k7/8/6p1/8/8/7P/8/K7 w - - 0 1": 4,
"k7/8/8/3p4/4p3/8/8/7K w - - 0 1": 3,
"k7/8/3p4/8/8/4P3/8/7K w - - 0 1": 4,
"7k/3p4/8/8/3P4/8/8/K7 b - - 0 1": 5,
"7k/8/8/3p4/8/8/3P4/K7 b - - 0 1": 4,
"k7/8/8/7p/6P1/8/8/K7 b - - 0 1": 5,
"k7/8/7p/8/8/6P1/8/K7 b - - 0 1": 4,
"k7/8/8/6p1/7P/8/8/K7 b - - 0 1": 5,
"k7/8/6p1/8/8/7P/8/K7 b - - 0 1": 4,
"k7/8/8/3p4/4p3/8/8/7K b - - 0 1": 5,
"k7/8/3p4/8/8/4P3/8/7K b - - 0 1": 4,
"7k/8/8/p7/1P6/8/8/7K w - - 0 1": 5,
"7k/8/p7/8/8/1P6/8/7K w - - 0 1": 4,
"7k/8/8/1p6/P7/8/8/7K w - - 0 1": 5,
"7k/8/1p6/8/8/P7/8/7K w - - 0 1": 4,
"k7/7p/8/8/8/8/6P1/K7 w - - 0 1": 5,
"k7/6p1/8/8/8/8/7P/K7 w - - 0 1": 5,
"3k4/3pp3/8/8/8/8/3PP3/3K4 w - - 0 1": 7,
"7k/8/8/p7/1P6/8/8/7K b - - 0 1": 5,
"7k/8/p7/8/8/1P6/8/7K b - - 0 1": 4,
"7k/8/8/1p6/P7/8/8/7K b - - 0 1": 5,
"7k/8/1p6/8/8/P7/8/7K b - - 0 1": 4,
"k7/7p/8/8/8/8/6P1/K7 b - - 0 1": 5,
"k7/6p1/8/8/8/8/7P/K7 b - - 0 1": 5,
"3k4/3pp3/8/8/8/8/3PP3/3K4 b - - 0 1": 7,
"8/Pk6/8/8/8/8/6Kp/8 w - - 0 1": 11,
"n1n5/1Pk5/8/8/8/8/5Kp1/5N1N w - - 0 1": 24,
"8/PPPk4/8/8/8/8/4Kppp/8 w - - 0 1": 18,
"n1n5/PPPk4/8/8/8/8/4Kppp/5N1N w - - 0 1": 24,
"8/Pk6/8/8/8/8/6Kp/8 b - - 0 1": 11,
"n1n5/1Pk5/8/8/8/8/5Kp1/5N1N b - - 0 1": 24,
"8/PPPk4/8/8/8/8/4Kppp/8 b - - 0 1": 18,
"n1n5/PPPk4/8/8/8/8/4Kppp/5N1N b - - 0 1": 24}
for k, v := range positions {
b := ParseFen(k)
fenbefore := b.ToFen()
moves := b.GenerateLegalMoves()
fenafter := b.ToFen()
if fenbefore != fenafter {
t.Error("Move generation corrupted board state. Before:\n", fenbefore, "\nAfter:\n", fenafter)
}
if len(moves) != v {
t.Error("Legal moves: wrong length. Expected", v, "but got", len(moves), "for position\n", b.ToFen())
//printMoves(moves)
}
}
}