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fix: appease golint..
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@dechristopher
dechristopher committed Feb 20, 2021
1 parent f40294a commit 14d8db8
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302 changes: 302 additions & 0 deletions move_test.go
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package octad
//
//import (
// "log"
// "testing"
//)
//
//type moveTest struct {
// pos *Position
// m *Move
// postPos *Position
//}
//
//var (
// validMoves = []moveTest{
// // pawn moves
// {m: &Move{s1: E2, s2: E4}, pos: unsafeOFEN("rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1")},
// {m: &Move{s1: A2, s2: A3}, pos: unsafeOFEN("8/8/8/8/8/8/P7/8 w - - 0 1")},
// {m: &Move{s1: A7, s2: A6}, pos: unsafeOFEN("8/p7/8/8/8/8/8/8 b - - 0 1")},
// {m: &Move{s1: A7, s2: A5}, pos: unsafeOFEN("8/p7/8/8/8/8/8/8 b - - 0 1")},
// {m: &Move{s1: C4, s2: B5}, pos: unsafeOFEN("8/8/8/1p1p4/2P5/8/8/8 w - - 0 1")},
// {m: &Move{s1: C4, s2: D5}, pos: unsafeOFEN("8/8/8/1p1p4/2P5/8/8/8 w - - 0 1")},
// {m: &Move{s1: C4, s2: C5}, pos: unsafeOFEN("8/8/8/1p1p4/2P5/8/8/8 w - - 0 1")},
// {m: &Move{s1: C5, s2: B4}, pos: unsafeOFEN("8/8/8/2p5/1P1P4/8/8/8 b - - 0 1")},
// {m: &Move{s1: C5, s2: D4}, pos: unsafeOFEN("8/8/8/2p5/1P1P4/8/8/8 b - - 0 1")},
// {m: &Move{s1: C5, s2: C4}, pos: unsafeOFEN("8/8/8/2p5/1P1P4/8/8/8 b - - 0 1")},
// {m: &Move{s1: A4, s2: B3}, pos: unsafeOFEN("2r3k1/1q1nbppp/r3p3/3pP3/pPpP4/P1Q2N2/2RN1PPP/2R4K b - b3 0 23")},
// {m: &Move{s1: A2, s2: A1, promo: Queen}, pos: unsafeOFEN("8/8/8/8/8/8/p7/8 b - - 0 1")},
// {m: &Move{s1: E7, s2: E6}, pos: unsafeOFEN("r2qkbnr/pppnpppp/8/3p4/6b1/1P3NP1/PBPPPP1P/RN1QKB1R b KQkq - 2 4")},
// // knight moves
// {m: &Move{s1: E4, s2: F6}, pos: unsafeOFEN("8/8/8/3pp3/4N3/8/5B2/8 w - - 0 1")},
// {m: &Move{s1: E4, s2: D6}, pos: unsafeOFEN("8/8/8/3pp3/4N3/8/5B2/8 w - - 0 1")},
// {m: &Move{s1: E4, s2: G5}, pos: unsafeOFEN("8/8/8/3pp3/4N3/8/5B2/8 w - - 0 1")},
// {m: &Move{s1: E4, s2: G3}, pos: unsafeOFEN("8/8/8/3pp3/4N3/8/5B2/8 w - - 0 1")},
// {m: &Move{s1: E4, s2: D2}, pos: unsafeOFEN("8/8/8/3pp3/4N3/8/5B2/8 w - - 0 1")},
// {m: &Move{s1: E4, s2: C3}, pos: unsafeOFEN("8/8/8/3pp3/4N3/8/5B2/8 w - - 0 1")},
// {m: &Move{s1: E4, s2: C5}, pos: unsafeOFEN("8/8/8/3pp3/4N3/8/5B2/8 w - - 0 1")},
// {m: &Move{s1: B8, s2: D7}, pos: unsafeOFEN("rn1qkb1r/pp3ppp/2p1pn2/3p4/2PP4/2NQPN2/PP3PPP/R1B1K2R b KQkq - 0 7")},
// {m: &Move{s1: F6, s2: E4}, pos: unsafeOFEN("r1b1k2r/ppp2ppp/2p2n2/4N3/4P3/2P5/PPP2PPP/R1BK3R b kq - 0 8")},
// // bishop moves
// {m: &Move{s1: E4, s2: H7}, pos: unsafeOFEN("8/8/8/3pp3/4B3/5N2/8/8 w - - 0 1")},
// {m: &Move{s1: E4, s2: D5}, pos: unsafeOFEN("8/8/8/3pp3/4B3/5N2/8/8 w - - 0 1")},
// {m: &Move{s1: E4, s2: B1}, pos: unsafeOFEN("8/8/8/3pp3/4B3/5N2/8/8 w - - 0 1")},
// // rook moves
// {m: &Move{s1: B2, s2: B4}, pos: unsafeOFEN("8/1p5b/4N3/4p3/8/8/1R6/1B6 w - - 0 1")},
// {m: &Move{s1: B2, s2: B7}, pos: unsafeOFEN("8/1p5b/4N3/4p3/8/8/1R6/1B6 w - - 0 1")},
// {m: &Move{s1: B2, s2: A2}, pos: unsafeOFEN("8/1p5b/4N3/4p3/8/8/1R6/1B6 w - - 0 1")},
// {m: &Move{s1: B2, s2: H2}, pos: unsafeOFEN("8/1p5b/4N3/4p3/8/8/1R6/1B6 w - - 0 1")},
// {m: &Move{s1: E1, s2: E8}, pos: unsafeOFEN("r3r1k1/p4p1p/3p4/1p4p1/2pP4/2P2P2/PP3P1P/R3RK2 w - g6 0 22")},
// // queen moves
// {m: &Move{s1: B2, s2: E5}, pos: unsafeOFEN("8/1p5b/4N3/4p3/8/8/1Q6/1B6 w - - 0 1")},
// {m: &Move{s1: B2, s2: A1}, pos: unsafeOFEN("8/1p5b/4N3/4p3/8/8/1Q6/1B6 w - - 0 1")},
// {m: &Move{s1: B2, s2: A2}, pos: unsafeOFEN("8/1p5b/4N3/4p3/8/8/1Q6/1B6 w - - 0 1")},
// {m: &Move{s1: B2, s2: H2}, pos: unsafeOFEN("8/1p5b/4N3/4p3/8/8/1Q6/1B6 w - - 0 1")},
// {m: &Move{s1: D8, s2: D1}, pos: unsafeOFEN("r1bqk2r/ppp2ppp/2p2n2/4N3/4P3/2P5/PPP2PPP/R1BQK2R b KQkq - 0 7")},
// // king moves
// {m: &Move{s1: E4, s2: E5}, pos: unsafeOFEN("5r2/8/8/8/4K3/8/8/8 w - - 0 1")},
// {m: &Move{s1: E4, s2: E3}, pos: unsafeOFEN("5r2/8/8/8/4K3/8/8/8 w - - 0 1")},
// {m: &Move{s1: E4, s2: D3}, pos: unsafeOFEN("5r2/8/8/8/4K3/8/8/8 w - - 0 1")},
// {m: &Move{s1: E4, s2: D4}, pos: unsafeOFEN("5r2/8/8/8/4K3/8/8/8 w - - 0 1")},
// {m: &Move{s1: E4, s2: D5}, pos: unsafeOFEN("5r2/8/8/8/4K3/8/8/8 w - - 0 1")},
// {m: &Move{s1: E4, s2: E5}, pos: unsafeOFEN("5r2/8/8/8/4K3/8/8/8 w - - 0 1")},
// // castleing
// {m: &Move{s1: E1, s2: G1}, pos: unsafeOFEN("r3k2r/8/8/8/8/8/8/R3K2R w KQkq - 0 1")},
// {m: &Move{s1: E1, s2: C1}, pos: unsafeOFEN("r3k2r/8/8/8/8/8/8/R3K2R w KQkq - 0 1")},
// {m: &Move{s1: E8, s2: G8}, pos: unsafeOFEN("r3k2r/8/8/8/8/8/8/R3K2R b KQkq - 0 1")},
// {m: &Move{s1: E8, s2: C8}, pos: unsafeOFEN("r3k2r/8/8/8/8/8/8/R3K2R b KQkq - 0 1")},
// // king moving in front of enemy pawn https://en.lichess.org/4HXJOtpN#75
// {m: &Move{s1: F8, s2: G7}, pos: unsafeOFEN("3rrk2/8/2p3P1/1p2nP1p/pP2p3/P1B1NbPB/2P2K2/5R2 b - - 1 38")},
// }
//
// invalidMoves = []moveTest{
// // out of turn moves
// {m: &Move{s1: E7, s2: E5}, pos: unsafeOFEN("rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1")},
// {m: &Move{s1: E2, s2: E4}, pos: unsafeOFEN("rnbqkbnr/1ppppppp/p7/8/8/8/PPPPPPPP/RNBQKBNR b KQkq - 0 1")},
// // pawn moves
// {m: &Move{s1: E2, s2: D3}, pos: unsafeOFEN("rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1")},
// {m: &Move{s1: E2, s2: F3}, pos: unsafeOFEN("rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1")},
// {m: &Move{s1: E2, s2: E5}, pos: unsafeOFEN("rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1")},
// {m: &Move{s1: A2, s2: A1}, pos: unsafeOFEN("8/8/8/8/8/8/p7/8 b - - 0 1")},
// {m: &Move{s1: E6, s2: E5}, pos: unsafeOFEN(`2b1r3/2k2p1B/p2np3/4B3/8/5N2/PP1K1PPP/3R4 b - - 2 1`)},
// {m: &Move{s1: H7, s2: H5}, pos: unsafeOFEN(`2bqkbnr/rpppp2p/2n2p2/p5pB/5P2/4P3/PPPP2PP/RNBQK1NR b KQk - 4 6`)},
// // knight moves
// {m: &Move{s1: E4, s2: F2}, pos: unsafeOFEN("8/8/8/3pp3/4N3/8/5B2/8 w - - 0 1")},
// {m: &Move{s1: E4, s2: F3}, pos: unsafeOFEN("8/8/8/3pp3/4N3/8/5B2/8 w - - 0 1")},
// // bishop moves
// {m: &Move{s1: E4, s2: C6}, pos: unsafeOFEN("8/8/8/3pp3/4B3/5N2/8/8 w - - 0 1")},
// {m: &Move{s1: E4, s2: E5}, pos: unsafeOFEN("8/8/8/3pp3/4B3/5N2/8/8 w - - 0 1")},
// {m: &Move{s1: E4, s2: E4}, pos: unsafeOFEN("8/8/8/3pp3/4B3/5N2/8/8 w - - 0 1")},
// {m: &Move{s1: E4, s2: F3}, pos: unsafeOFEN("8/8/8/3pp3/4B3/5N2/8/8 w - - 0 1")},
// // rook moves
// {m: &Move{s1: B2, s2: B1}, pos: unsafeOFEN("8/1p5b/4N3/4p3/8/8/1R6/1B6 w - - 0 1")},
// {m: &Move{s1: B2, s2: C3}, pos: unsafeOFEN("8/1p5b/4N3/4p3/8/8/1R6/1B6 w - - 0 1")},
// {m: &Move{s1: B2, s2: B8}, pos: unsafeOFEN("8/1p5b/4N3/4p3/8/8/1R6/1B6 w - - 0 1")},
// {m: &Move{s1: B2, s2: G7}, pos: unsafeOFEN("8/1p5b/4N3/4p3/8/8/1R6/1B6 w - - 0 1")},
// // queen moves
// {m: &Move{s1: B2, s2: B1}, pos: unsafeOFEN("8/1p5b/4N3/4p3/8/8/1Q6/1B6 w - - 0 1")},
// {m: &Move{s1: B2, s2: C4}, pos: unsafeOFEN("8/1p5b/4N3/4p3/8/8/1Q6/1B6 w - - 0 1")},
// {m: &Move{s1: B2, s2: B8}, pos: unsafeOFEN("8/1p5b/4N3/4p3/8/8/1Q6/1B6 w - - 0 1")},
// {m: &Move{s1: B2, s2: G7}, pos: unsafeOFEN("8/1p5b/4N3/4p3/8/8/1Q6/1B6 w - - 0 1")},
// // king moves
// {m: &Move{s1: E4, s2: F3}, pos: unsafeOFEN("5r2/8/8/8/4K3/8/8/8 w - - 0 1")},
// {m: &Move{s1: E4, s2: F4}, pos: unsafeOFEN("5r2/8/8/8/4K3/8/8/8 w - - 0 1")},
// {m: &Move{s1: E4, s2: F5}, pos: unsafeOFEN("5r2/8/8/8/4K3/8/8/8 w - - 0 1")},
// // castleing
// {m: &Move{s1: E1, s2: B1}, pos: unsafeOFEN("r3k2r/8/8/8/8/8/8/R3K2R w KQkq - 0 1")},
// {m: &Move{s1: E8, s2: B8}, pos: unsafeOFEN("r3k2r/8/8/8/8/8/8/R3K2R b KQkq - 0 1")},
// {m: &Move{s1: E1, s2: C1}, pos: unsafeOFEN("r3k2r/8/8/8/8/8/8/R2QK2R w KQkq - 0 1")},
// {m: &Move{s1: E1, s2: C1}, pos: unsafeOFEN("2r1k2r/8/8/8/8/8/8/R3K2R w KQkq - 0 1")},
// {m: &Move{s1: E1, s2: C1}, pos: unsafeOFEN("3rk2r/8/8/8/8/8/8/R3K2R w KQkq - 0 1")},
// {m: &Move{s1: E1, s2: G1}, pos: unsafeOFEN("r3k2r/8/8/8/8/8/8/R3K2R w Qkq - 0 1")},
// {m: &Move{s1: E1, s2: C1}, pos: unsafeOFEN("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: unsafeOFEN("rn1qkb1r/pp3ppp/2p1pn2/3p4/2PP4/2NQPN2/PP3PPP/R1B1K2R b KQkq - 0 7")},
// // en passant on doubled pawn file https://en.lichess.org/TnRtrHxf#24
// {m: &Move{s1: E3, s2: F6}, pos: unsafeOFEN("r1b2rk1/pp2b1pp/1qn1p3/3pPp2/1P1P4/P2BPN2/6PP/RN1Q1RK1 w - f6 0 13")},
// // can't move piece out of pin (even if checking enemy king) https://en.lichess.org/JCRBhXH7#62
// {m: &Move{s1: E1, s2: E7}, pos: unsafeOFEN("4R3/1r1k2pp/p1p5/1pP5/8/8/1PP3PP/2K1Rr2 w - - 5 32")},
// // invalid one up pawn capture
// {m: &Move{s1: E6, s2: E5}, pos: unsafeOFEN(`2b1r3/2k2p1B/p2np3/4B3/8/5N2/PP1K1PPP/3R4 b - - 2 1`)},
// // invalid two up pawn capture
// {m: &Move{s1: H7, s2: H5}, pos: unsafeOFEN(`2bqkbnr/rpppp2p/2n2p2/p5pB/5P2/4P3/PPPP2PP/RNBQK1NR b KQk - 4 6`)},
// // invalid pawn move d5e4
// {m: &Move{s1: D5, s2: E4}, pos: unsafeOFEN(`rnbqkbnr/pp2pppp/8/2pp4/3P4/4PN2/PPP2PPP/RNBQKB1R b KQkq - 0 3`)},
// }
//
// positionUpdates = []moveTest{
// {
// m: &Move{s1: E2, s2: E4},
// pos: unsafeOFEN("rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1"),
// postPos: unsafeOFEN("rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq e3 0 1"),
// },
// {
// m: &Move{s1: E1, s2: G1, tags: KingSideCastle},
// pos: unsafeOFEN("r3k2r/8/8/8/8/8/8/R3K2R w KQkq - 0 1"),
// postPos: unsafeOFEN("r3k2r/8/8/8/8/8/8/R4RK1 b kq - 0 1"),
// },
// {
// m: &Move{s1: A4, s2: B3, tags: EnPassant},
// pos: unsafeOFEN("2r3k1/1q1nbppp/r3p3/3pP3/pPpP4/P1Q2N2/2RN1PPP/2R4K b - b3 0 23"),
// postPos: unsafeOFEN("2r3k1/1q1nbppp/r3p3/3pP3/11pP4/PpQ2N2/2RN1PPP/2R4K w - - 0 24"),
// },
// {
// m: &Move{s1: E1, s2: G1, tags: KingSideCastle},
// pos: unsafeOFEN("r2qk2r/pp1n1ppp/2pbpn2/3p4/2PP4/1PNQPN2/P4PPP/R1B1K2R w KQkq - 1 9"),
// postPos: unsafeOFEN("r2qk2r/pp1n1ppp/2pbpn2/3p4/2PP4/1PNQPN2/P4PPP/R1B2RK1 b kq - 0 9"),
// },
// }
//)
//
//func unsafeOFEN(s string) *Position {
// pos, err := decodeOFEN(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: unsafeOFEN("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: unsafeOFEN("r3k2r/p1ppqpb1/bn2pnp1/3PN3/1p2P3/2N2Q1p/PPPBBPPP/R3K2R w KQkq - 0 1"), nodesPerDepth: []int{
// 48, 2039, 97862,
// // 4085603, 193690690
// }},
// {pos: unsafeOFEN("8/2p5/3p4/KP5r/1R3p1k/8/4P1P1/8 w - - 0 1"), nodesPerDepth: []int{
// 14, 191, 2812, 43238, 674624,
// // 11030083, 178633661
// }},
// {pos: unsafeOFEN("r3k2r/Pppp1ppp/1b3nbN/nP6/BBP1P3/q4N2/Pp1P2PP/R2Q1RK1 w kq - 0 1"), nodesPerDepth: []int{
// 6, 264, 9467, 422333,
// // 15833292, 706045033
// }},
// {pos: unsafeOFEN("r2q1rk1/pP1p2pp/Q4n2/bbp1p3/Np6/1B3NBn/pPPP1PPP/R3K2R b KQ - 0 1"), nodesPerDepth: []int{
// 6, 264, 9467, 422333,
// // 15833292, 706045033
// }},
// {pos: unsafeOFEN("rnbq1k1r/pp1Pbppp/2p5/8/2B5/8/PPP1NnPP/RNBQK2R w KQ - 1 8"), nodesPerDepth: []int{
// 44, 1486, 62379,
// // 2103487, 89941194
// }},
// {pos: unsafeOFEN("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 (https://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 := unsafeOFEN("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
//}
32 changes: 16 additions & 16 deletions square.go
View file
Original file line number Diff line number Diff line change
Expand Up @@ -38,37 +38,37 @@ func getSquare(f File, r Rank) Square {
const (
// NoSquare represents an invalid square
NoSquare Square = iota - 1
// The A1 square, index 0
// A1 square, index 0
A1
// The B1 square, index 1
// B1 square, index 1
B1
// The C1 square, index 2
// C1 square, index 2
C1
// The D1 square, index 3
// D1 square, index 3
D1
// The A2 square, index 4
// A2 square, index 4
A2
// The B2 square, index 5
// B2 square, index 5
B2
// The C2 square, index 6
// C2 square, index 6
C2
// The D2 square, index 7
// D2 square, index 7
D2
// The A3 square, index 8
// A3 square, index 8
A3
// The B3 square, index 9
// B3 square, index 9
B3
// The C3 square, index 10
// C3 square, index 10
C3
// The D3 square, index 11
// D3 square, index 11
D3
// The A4 square, index 12
// A4 square, index 12
A4
// The B4 square, index 13
// B4 square, index 13
B4
// The C4 square, index 14
// C4 square, index 14
C4
// The D4 square, index 15
// D4 square, index 15
D4
)

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