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move_test.go
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move_test.go
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package chess
import (
"log"
"testing"
)
type moveTest struct {
pos *Position
m *Move
postPos *Position
}
var (
validMoves = []moveTest{
// pawn moves
{m: &Move{s1: E2, s2: E4}, pos: unsafeFEN("rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1")},
{m: &Move{s1: A2, s2: A3}, pos: unsafeFEN("8/8/8/8/8/8/P7/8 w - - 0 1")},
{m: &Move{s1: A7, s2: A6}, pos: unsafeFEN("8/p7/8/8/8/8/8/8 b - - 0 1")},
{m: &Move{s1: A7, s2: A5}, pos: unsafeFEN("8/p7/8/8/8/8/8/8 b - - 0 1")},
{m: &Move{s1: C4, s2: B5}, pos: unsafeFEN("8/8/8/1p1p4/2P5/8/8/8 w - - 0 1")},
{m: &Move{s1: C4, s2: D5}, pos: unsafeFEN("8/8/8/1p1p4/2P5/8/8/8 w - - 0 1")},
{m: &Move{s1: C4, s2: C5}, pos: unsafeFEN("8/8/8/1p1p4/2P5/8/8/8 w - - 0 1")},
{m: &Move{s1: C5, s2: B4}, pos: unsafeFEN("8/8/8/2p5/1P1P4/8/8/8 b - - 0 1")},
{m: &Move{s1: C5, s2: D4}, pos: unsafeFEN("8/8/8/2p5/1P1P4/8/8/8 b - - 0 1")},
{m: &Move{s1: C5, s2: C4}, pos: unsafeFEN("8/8/8/2p5/1P1P4/8/8/8 b - - 0 1")},
{m: &Move{s1: A4, s2: B3}, pos: unsafeFEN("2r3k1/1q1nbppp/r3p3/3pP3/pPpP4/P1Q2N2/2RN1PPP/2R4K b - b3 0 23")},
{m: &Move{s1: A2, s2: A1, promo: Queen}, pos: unsafeFEN("8/8/8/8/8/8/p7/8 b - - 0 1")},
{m: &Move{s1: E7, s2: E6}, pos: unsafeFEN("r2qkbnr/pppnpppp/8/3p4/6b1/1P3NP1/PBPPPP1P/RN1QKB1R b KQkq - 2 4")},
// knight moves
{m: &Move{s1: E4, s2: F6}, pos: unsafeFEN("8/8/8/3pp3/4N3/8/5B2/8 w - - 0 1")},
{m: &Move{s1: E4, s2: D6}, pos: unsafeFEN("8/8/8/3pp3/4N3/8/5B2/8 w - - 0 1")},
{m: &Move{s1: E4, s2: G5}, pos: unsafeFEN("8/8/8/3pp3/4N3/8/5B2/8 w - - 0 1")},
{m: &Move{s1: E4, s2: G3}, pos: unsafeFEN("8/8/8/3pp3/4N3/8/5B2/8 w - - 0 1")},
{m: &Move{s1: E4, s2: D2}, pos: unsafeFEN("8/8/8/3pp3/4N3/8/5B2/8 w - - 0 1")},
{m: &Move{s1: E4, s2: C3}, pos: unsafeFEN("8/8/8/3pp3/4N3/8/5B2/8 w - - 0 1")},
{m: &Move{s1: E4, s2: C5}, pos: unsafeFEN("8/8/8/3pp3/4N3/8/5B2/8 w - - 0 1")},
{m: &Move{s1: B8, s2: D7}, pos: unsafeFEN("rn1qkb1r/pp3ppp/2p1pn2/3p4/2PP4/2NQPN2/PP3PPP/R1B1K2R b KQkq - 0 7")},
{m: &Move{s1: F6, s2: E4}, pos: unsafeFEN("r1b1k2r/ppp2ppp/2p2n2/4N3/4P3/2P5/PPP2PPP/R1BK3R b kq - 0 8")},
// bishop moves
{m: &Move{s1: E4, s2: H7}, pos: unsafeFEN("8/8/8/3pp3/4B3/5N2/8/8 w - - 0 1")},
{m: &Move{s1: E4, s2: D5}, pos: unsafeFEN("8/8/8/3pp3/4B3/5N2/8/8 w - - 0 1")},
{m: &Move{s1: E4, s2: B1}, pos: unsafeFEN("8/8/8/3pp3/4B3/5N2/8/8 w - - 0 1")},
// rook moves
{m: &Move{s1: B2, s2: B4}, pos: unsafeFEN("8/1p5b/4N3/4p3/8/8/1R6/1B6 w - - 0 1")},
{m: &Move{s1: B2, s2: B7}, pos: unsafeFEN("8/1p5b/4N3/4p3/8/8/1R6/1B6 w - - 0 1")},
{m: &Move{s1: B2, s2: A2}, pos: unsafeFEN("8/1p5b/4N3/4p3/8/8/1R6/1B6 w - - 0 1")},
{m: &Move{s1: B2, s2: H2}, pos: unsafeFEN("8/1p5b/4N3/4p3/8/8/1R6/1B6 w - - 0 1")},
{m: &Move{s1: E1, s2: E8}, pos: unsafeFEN("r3r1k1/p4p1p/3p4/1p4p1/2pP4/2P2P2/PP3P1P/R3RK2 w - g6 0 22")},
// queen moves
{m: &Move{s1: B2, s2: E5}, pos: unsafeFEN("8/1p5b/4N3/4p3/8/8/1Q6/1B6 w - - 0 1")},
{m: &Move{s1: B2, s2: A1}, pos: unsafeFEN("8/1p5b/4N3/4p3/8/8/1Q6/1B6 w - - 0 1")},
{m: &Move{s1: B2, s2: A2}, pos: unsafeFEN("8/1p5b/4N3/4p3/8/8/1Q6/1B6 w - - 0 1")},
{m: &Move{s1: B2, s2: H2}, pos: unsafeFEN("8/1p5b/4N3/4p3/8/8/1Q6/1B6 w - - 0 1")},
{m: &Move{s1: D8, s2: D1}, pos: unsafeFEN("r1bqk2r/ppp2ppp/2p2n2/4N3/4P3/2P5/PPP2PPP/R1BQK2R b KQkq - 0 7")},
// king moves
{m: &Move{s1: E4, s2: E5}, pos: unsafeFEN("5r2/8/8/8/4K3/8/8/8 w - - 0 1")},
{m: &Move{s1: E4, s2: E3}, pos: unsafeFEN("5r2/8/8/8/4K3/8/8/8 w - - 0 1")},
{m: &Move{s1: E4, s2: D3}, pos: unsafeFEN("5r2/8/8/8/4K3/8/8/8 w - - 0 1")},
{m: &Move{s1: E4, s2: D4}, pos: unsafeFEN("5r2/8/8/8/4K3/8/8/8 w - - 0 1")},
{m: &Move{s1: E4, s2: D5}, pos: unsafeFEN("5r2/8/8/8/4K3/8/8/8 w - - 0 1")},
{m: &Move{s1: E4, s2: E5}, pos: unsafeFEN("5r2/8/8/8/4K3/8/8/8 w - - 0 1")},
// castleing
{m: &Move{s1: E1, s2: G1}, pos: unsafeFEN("r3k2r/8/8/8/8/8/8/R3K2R w KQkq - 0 1")},
{m: &Move{s1: E1, s2: C1}, pos: unsafeFEN("r3k2r/8/8/8/8/8/8/R3K2R w KQkq - 0 1")},
{m: &Move{s1: E8, s2: G8}, pos: unsafeFEN("r3k2r/8/8/8/8/8/8/R3K2R b KQkq - 0 1")},
{m: &Move{s1: E8, s2: C8}, pos: unsafeFEN("r3k2r/8/8/8/8/8/8/R3K2R b KQkq - 0 1")},
// king moving in front of enemy pawn http://en.lichess.org/4HXJOtpN#75
{m: &Move{s1: F8, s2: G7}, pos: unsafeFEN("3rrk2/8/2p3P1/1p2nP1p/pP2p3/P1B1NbPB/2P2K2/5R2 b - - 1 38")},
}
invalidMoves = []moveTest{
// out of turn moves
{m: &Move{s1: E7, s2: E5}, pos: unsafeFEN("rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1")},
{m: &Move{s1: E2, s2: E4}, pos: unsafeFEN("rnbqkbnr/1ppppppp/p7/8/8/8/PPPPPPPP/RNBQKBNR b KQkq - 0 1")},
// pawn moves
{m: &Move{s1: E2, s2: D3}, pos: unsafeFEN("rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1")},
{m: &Move{s1: E2, s2: F3}, pos: unsafeFEN("rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1")},
{m: &Move{s1: E2, s2: E5}, pos: unsafeFEN("rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1")},
{m: &Move{s1: A2, s2: A1}, pos: unsafeFEN("8/8/8/8/8/8/p7/8 b - - 0 1")},
{m: &Move{s1: E6, s2: E5}, pos: unsafeFEN(`2b1r3/2k2p1B/p2np3/4B3/8/5N2/PP1K1PPP/3R4 b - - 2 1`)},
{m: &Move{s1: H7, s2: H5}, pos: unsafeFEN(`2bqkbnr/rpppp2p/2n2p2/p5pB/5P2/4P3/PPPP2PP/RNBQK1NR b KQk - 4 6`)},
// knight moves
{m: &Move{s1: E4, s2: F2}, pos: unsafeFEN("8/8/8/3pp3/4N3/8/5B2/8 w - - 0 1")},
{m: &Move{s1: E4, s2: F3}, pos: unsafeFEN("8/8/8/3pp3/4N3/8/5B2/8 w - - 0 1")},
// bishop moves
{m: &Move{s1: E4, s2: C6}, pos: unsafeFEN("8/8/8/3pp3/4B3/5N2/8/8 w - - 0 1")},
{m: &Move{s1: E4, s2: E5}, pos: unsafeFEN("8/8/8/3pp3/4B3/5N2/8/8 w - - 0 1")},
{m: &Move{s1: E4, s2: E4}, pos: unsafeFEN("8/8/8/3pp3/4B3/5N2/8/8 w - - 0 1")},
{m: &Move{s1: E4, s2: F3}, pos: unsafeFEN("8/8/8/3pp3/4B3/5N2/8/8 w - - 0 1")},
// rook moves
{m: &Move{s1: B2, s2: B1}, pos: unsafeFEN("8/1p5b/4N3/4p3/8/8/1R6/1B6 w - - 0 1")},
{m: &Move{s1: B2, s2: C3}, pos: unsafeFEN("8/1p5b/4N3/4p3/8/8/1R6/1B6 w - - 0 1")},
{m: &Move{s1: B2, s2: B8}, pos: unsafeFEN("8/1p5b/4N3/4p3/8/8/1R6/1B6 w - - 0 1")},
{m: &Move{s1: B2, s2: G7}, pos: unsafeFEN("8/1p5b/4N3/4p3/8/8/1R6/1B6 w - - 0 1")},
// queen moves
{m: &Move{s1: B2, s2: B1}, pos: unsafeFEN("8/1p5b/4N3/4p3/8/8/1Q6/1B6 w - - 0 1")},
{m: &Move{s1: B2, s2: C4}, pos: unsafeFEN("8/1p5b/4N3/4p3/8/8/1Q6/1B6 w - - 0 1")},
{m: &Move{s1: B2, s2: B8}, pos: unsafeFEN("8/1p5b/4N3/4p3/8/8/1Q6/1B6 w - - 0 1")},
{m: &Move{s1: B2, s2: G7}, pos: unsafeFEN("8/1p5b/4N3/4p3/8/8/1Q6/1B6 w - - 0 1")},
// king moves
{m: &Move{s1: E4, s2: F3}, pos: unsafeFEN("5r2/8/8/8/4K3/8/8/8 w - - 0 1")},
{m: &Move{s1: E4, s2: F4}, pos: unsafeFEN("5r2/8/8/8/4K3/8/8/8 w - - 0 1")},
{m: &Move{s1: E4, s2: F5}, pos: unsafeFEN("5r2/8/8/8/4K3/8/8/8 w - - 0 1")},
// castleing
{m: &Move{s1: E1, s2: B1}, pos: unsafeFEN("r3k2r/8/8/8/8/8/8/R3K2R w KQkq - 0 1")},
{m: &Move{s1: E8, s2: B8}, pos: unsafeFEN("r3k2r/8/8/8/8/8/8/R3K2R b KQkq - 0 1")},
{m: &Move{s1: E1, s2: C1}, pos: unsafeFEN("r3k2r/8/8/8/8/8/8/R2QK2R w KQkq - 0 1")},
{m: &Move{s1: E1, s2: C1}, pos: unsafeFEN("2r1k2r/8/8/8/8/8/8/R3K2R w KQkq - 0 1")},
{m: &Move{s1: E1, s2: C1}, pos: unsafeFEN("3rk2r/8/8/8/8/8/8/R3K2R w KQkq - 0 1")},
{m: &Move{s1: E1, s2: G1}, pos: unsafeFEN("r3k2r/8/8/8/8/8/8/R3K2R w Qkq - 0 1")},
{m: &Move{s1: E1, s2: C1}, pos: unsafeFEN("r3k2r/8/8/8/8/8/8/R3K2R w Kkq - 0 1")},
// invalid promotion for non-pawn move
{m: &Move{s1: B8, s2: D7, promo: Pawn}, pos: unsafeFEN("rn1qkb1r/pp3ppp/2p1pn2/3p4/2PP4/2NQPN2/PP3PPP/R1B1K2R b KQkq - 0 7")},
// en passant on doubled pawn file http://en.lichess.org/TnRtrHxf#24
{m: &Move{s1: E3, s2: F6}, pos: unsafeFEN("r1b2rk1/pp2b1pp/1qn1p3/3pPp2/1P1P4/P2BPN2/6PP/RN1Q1RK1 w - f6 0 13")},
// can't move piece out of pin (even if checking enemy king) http://en.lichess.org/JCRBhXH7#62
{m: &Move{s1: E1, s2: E7}, pos: unsafeFEN("4R3/1r1k2pp/p1p5/1pP5/8/8/1PP3PP/2K1Rr2 w - - 5 32")},
// invalid one up pawn capture
{m: &Move{s1: E6, s2: E5}, pos: unsafeFEN(`2b1r3/2k2p1B/p2np3/4B3/8/5N2/PP1K1PPP/3R4 b - - 2 1`)},
// invalid two up pawn capture
{m: &Move{s1: H7, s2: H5}, pos: unsafeFEN(`2bqkbnr/rpppp2p/2n2p2/p5pB/5P2/4P3/PPPP2PP/RNBQK1NR b KQk - 4 6`)},
// invalid pawn move d5e4
{m: &Move{s1: D5, s2: E4}, pos: unsafeFEN(`rnbqkbnr/pp2pppp/8/2pp4/3P4/4PN2/PPP2PPP/RNBQKB1R b KQkq - 0 3`)},
}
positionUpdates = []moveTest{
{
m: &Move{s1: E2, s2: E4},
pos: unsafeFEN("rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1"),
postPos: unsafeFEN("rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq e3 0 1"),
},
{
m: &Move{s1: E1, s2: G1, tags: KingSideCastle},
pos: unsafeFEN("r3k2r/8/8/8/8/8/8/R3K2R w KQkq - 0 1"),
postPos: unsafeFEN("r3k2r/8/8/8/8/8/8/R4RK1 b kq - 0 1"),
},
{
m: &Move{s1: A4, s2: B3, tags: EnPassant},
pos: unsafeFEN("2r3k1/1q1nbppp/r3p3/3pP3/pPpP4/P1Q2N2/2RN1PPP/2R4K b - b3 0 23"),
postPos: unsafeFEN("2r3k1/1q1nbppp/r3p3/3pP3/11pP4/PpQ2N2/2RN1PPP/2R4K w - - 0 24"),
},
{
m: &Move{s1: E1, s2: G1, tags: KingSideCastle},
pos: unsafeFEN("r2qk2r/pp1n1ppp/2pbpn2/3p4/2PP4/1PNQPN2/P4PPP/R1B1K2R w KQkq - 1 9"),
postPos: unsafeFEN("r2qk2r/pp1n1ppp/2pbpn2/3p4/2PP4/1PNQPN2/P4PPP/R1B2RK1 b kq - 0 9"),
},
}
)
func unsafeFEN(s string) *Position {
pos, err := decodeFEN(s)
if err != nil {
log.Fatal(err)
}
return pos
}
func TestValidMoves(t *testing.T) {
for _, mt := range validMoves {
if !moveIsValid(mt.pos, mt.m, false) {
log.Println(mt.pos.String())
log.Println(mt.pos.board.Draw())
log.Println(mt.pos.ValidMoves())
log.Println("In Check:", squaresAreAttacked(mt.pos, mt.pos.board.whiteKingSq))
// log.Println("In Check:", mt.pos.inCheck())
mt.pos.turn = mt.pos.turn.Other()
t.Fatalf("expected move %s to be valid", mt.m)
}
}
}
func TestInvalidMoves(t *testing.T) {
for _, mt := range invalidMoves {
if moveIsValid(mt.pos, mt.m, false) {
log.Println(mt.pos.String())
log.Println(mt.pos.board.Draw())
t.Fatalf("expected move %s to be invalid", mt.m)
}
}
}
func TestPositionUpdates(t *testing.T) {
for _, mt := range positionUpdates {
if !moveIsValid(mt.pos, mt.m, true) {
log.Println(mt.pos.String())
log.Println(mt.pos.board.Draw())
log.Println(mt.pos.ValidMoves())
t.Fatalf("expected move %s %v to be valid", mt.m, mt.m.tags)
}
postPos := mt.pos.Update(mt.m)
if postPos.String() != mt.postPos.String() {
t.Fatalf("starting from board \n%s%s\n after move %s\n expected board to be %s\n%s\n but was %s\n%s\n",
mt.pos.String(),
mt.pos.board.Draw(),
mt.m.String(),
mt.postPos.String(),
mt.postPos.board.Draw(),
postPos.String(),
postPos.board.Draw(),
)
}
}
}
type perfTest struct {
pos *Position
nodesPerDepth []int
}
/* https://www.chessprogramming.org/Perft_Results */
var perfResults = []perfTest{
{pos: unsafeFEN("rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1"), nodesPerDepth: []int{
20, 400, 8902, 197281,
// 4865609, 119060324, 3195901860, 84998978956, 2439530234167, 69352859712417
}},
{pos: unsafeFEN("r3k2r/p1ppqpb1/bn2pnp1/3PN3/1p2P3/2N2Q1p/PPPBBPPP/R3K2R w KQkq - 0 1"), nodesPerDepth: []int{
48, 2039, 97862,
// 4085603, 193690690
}},
{pos: unsafeFEN("8/2p5/3p4/KP5r/1R3p1k/8/4P1P1/8 w - - 0 1"), nodesPerDepth: []int{
14, 191, 2812, 43238, 674624,
// 11030083, 178633661
}},
{pos: unsafeFEN("r3k2r/Pppp1ppp/1b3nbN/nP6/BBP1P3/q4N2/Pp1P2PP/R2Q1RK1 w kq - 0 1"), nodesPerDepth: []int{
6, 264, 9467, 422333,
// 15833292, 706045033
}},
{pos: unsafeFEN("r2q1rk1/pP1p2pp/Q4n2/bbp1p3/Np6/1B3NBn/pPPP1PPP/R3K2R b KQ - 0 1"), nodesPerDepth: []int{
6, 264, 9467, 422333,
// 15833292, 706045033
}},
{pos: unsafeFEN("rnbq1k1r/pp1Pbppp/2p5/8/2B5/8/PPP1NnPP/RNBQK2R w KQ - 1 8"), nodesPerDepth: []int{
44, 1486, 62379,
// 2103487, 89941194
}},
{pos: unsafeFEN("r4rk1/1pp1qppp/p1np1n2/2b1p1B1/2B1P1b1/P1NP1N2/1PP1QPPP/R4RK1 w - - 0 10"), nodesPerDepth: []int{
46, 2079, 89890,
// 3894594, 164075551, 6923051137, 287188994746, 11923589843526, 490154852788714
}},
}
func TestPerfResults(t *testing.T) {
for _, perf := range perfResults {
countMoves(t, perf.pos, []*Position{perf.pos}, perf.nodesPerDepth, len(perf.nodesPerDepth))
}
}
func countMoves(t *testing.T, originalPosition *Position, positions []*Position, nodesPerDepth []int, maxDepth int) {
if len(nodesPerDepth) == 0 {
return
}
depth := maxDepth - len(nodesPerDepth) + 1
expNodes := nodesPerDepth[0]
newPositions := make([]*Position, 0)
for _, pos := range positions {
for _, move := range pos.ValidMoves() {
newPos := pos.Update(move)
newPositions = append(newPositions, newPos)
}
}
gotNodes := len(newPositions)
if expNodes != gotNodes {
t.Errorf("Depth: %d Expected: %d Got: %d", depth, expNodes, gotNodes)
t.Log("##############################")
t.Log("# Original position info")
t.Log("###")
t.Log(originalPosition.String())
t.Log(originalPosition.board.Draw())
t.Log("##############################")
t.Log("# Details in JSONL (http://jsonlines.org)")
t.Log("###")
for _, pos := range positions {
t.Logf(`{"position": "%s", "moves": %d}`, pos.String(), len(pos.ValidMoves()))
}
}
countMoves(t, originalPosition, newPositions, nodesPerDepth[1:], maxDepth)
}
func BenchmarkValidMoves(b *testing.B) {
pos := unsafeFEN("rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1")
b.ResetTimer()
for n := 0; n < b.N; n++ {
pos.ValidMoves()
pos.validMoves = nil
}
}
func moveIsValid(pos *Position, m *Move, useTags bool) bool {
for _, move := range pos.ValidMoves() {
if move.s1 == m.s1 && move.s2 == m.s2 && move.promo == m.promo {
if useTags {
if m.tags != move.tags {
return false
}
}
return true
}
}
return false
}