lua5.1.> c0_chess.lua
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===== Routine a_SAMPLES of chess logic =====
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Setting up the starting position
wpa2;wpb2;wpc2;wpd2;wpe2;wpf2;wpg2;wph2;wRa1;wNb1;wBc1;wQd1;wKe1;wBf1;wNg1;wRh1;
bpa7;bpb7;bpc7;bpd7;bpe7;bpf7;bpg7;bph7;bRa8;bNb8;bBc8;bQd8;bKe8;bBf8;bNg8;bRh8;

FEN function : rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w QKqk - 0 1
Position after e4:
wpa2;wpb2;wpc2;wpd2;wpe4;wpf2;wpg2;wph2;wRa1;wNb1;wBc1;wQd1;wKe1;wBf1;wNg1;wRh1;
bpa7;bpb7;bpc7;bpd7;bpe7;bpf7;bpg7;bph7;bRa8;bNb8;bBc8;bQd8;bKe8;bBf8;bNg8;bRh8;

Last move:e2e4
All movements till now:e2e4
Now possible moves:
a7a6,a7a5,b7b6,b7b5,c7c6,c7c5,d7d6,d7d5,e7e6,e7e5,f7f6,f7f5,g7g6,g7g5,h7h6,h7h5,
b8c6,b8a6,g8h6,g8f6,
Position after takeback
wpa2;wpb2;wpc2;wpd2;wpe2;wpf2;wpg2;wph2;wRa1;wNb1;wBc1;wQd1;wKe1;wBf1;wNg1;wRh1;
bpa7;bpb7;bpc7;bpd7;bpe7;bpf7;bpg7;bph7;bRa8;bNb8;bBc8;bQd8;bKe8;bBf8;bNg8;bRh8;

Can move a2-a4?
true
White king in stalemate?
false
Check to white king?
false
Is checkmate to white king?
false
Piece on g7:bp
Is empty square g6?
true
Position after setup FEN=7k/Q7/2P2K2/8/8/8/8/8 w - - 0 70
bKh8;wQa7;wpc6;wKf6;
PGN -> moves
d2d4d7d5c2c4e7e6g1f3g8f6g2g3f8e7f1g2e8g8[0]e1g1[0]d5c4d1c2a7a6c2c4b7b5c4c2c8b7c1
d2b7e4c2c1e4b7c1c2a8a7f1c1b7e4c2b3e4d5b3e3b8d7d2a5e7d6b1c3d5b7f3g5b7g2g1g2d8a8e3
f3a8f3g2f3e6e5e2e3d6e7c3e2f8e8f3g2f6d5g5f3e7d6d4e5d7e5f3e5e8e5e2d4a7a8d4c6e5e6c1
c2d5b6b2b3g8f8a1d1f8e8c6d4e6f6e3e4f6g6e4e5d6e7c2c7b6d5c7b7e7d8d4f5d5f4g2f3d8a5g3
f4a5b4d1d7a8c8d7f7c8c3f3e4
moves -> PGN (reverse action)
1. d4 d5 2. c4 e6 3. Nf3 Nf6 4. g3 Be7 5. Bg2 O-O 6. O-O dxc4 7. Qc2 a6 8. Qxc4
b5 9. Qc2 Bb7 10. Bd2 Be4 11. Qc1 Bb7 12. Qc2 Ra7 13. Rc1 Be4 14. Qb3 Bd5 15. Qe
3 Nbd7 16. Ba5 Bd6 17. Nc3 Bb7 18. Ng5 Bxg2 19. Kxg2 Qa8+ 20. Qf3 Qxf3+ 21. Kxf3
 e5 22. e3 Be7 23. Ne2 Re8 24. Kg2 Nd5 25. Nf3 Bd6 26. dxe5 Nxe5 27. Nxe5 Rxe5 2
8. Nd4 Ra8 29. Nc6 Re6 30. Rc2 Nb6 31. b3 Kf8 32. Rd1 Ke8 33. Nd4 Rf6 34. e4 Rg6
 35. e5 Be7 36. Rxc7 Nd5 37. Rb7 Bd8 38. Nf5 Nf4+ 39. Kf3 Bxa5 40. gxf4 Bb4 41.
Rdd7 Rc8 42. Rxf7 Rc3+ 43. Ke4
Fischer-random  PGN -> moves
c2c4e7e5h1g3h8g6b2b3f7f6e2e3b7b6e1e2f8e6e2h5g8h8g3f5g6e7h5e8d8e8f1g3h7h5f5e7e8e7
d2d4d7d6h2h4e7f7d4d5e6f8f2f4c7c6f4e5d6e5e3e4b8d6b1d3f8g600**g6h4d3e2h4g6g3f5d6c5
g1h2g6f4c1c2c6d5e4d5h5h4e2g4c8e8a1b2g7g6f5d4e5d4f1f4c5d6
moves -> PGN (reverse action)
[White Aronian, Levon]
[Black Rosa, Mike]
[Result 0:1]
[SetUp "1"]
[FEN "bbrkqnrn/pppppppp/8/8/8/8/PPPPPPPP/BBRKQNRN w GCgc - 0 0"]

1. c4 e5 2. Nhg3 Nhg6 3. b3 f6 4. e3 b6 5. Qe2 Ne6 6. Qh5 Rh8 7. Nf5 Ne7 8. Qxe8
+ Kxe8 9. Nf1-g3 h5 10. Nxe7 Kxe7 11. d4 d6 12. h4 Kf7 13. d5 Nf8 14. f4 c6 15.
fxe5 dxe5 16. e4 Bd6 17. Bd3 Ng6 18. 0-0 Nxh4 19. Be2 Ng6 20. Nf5 Bc5+ 21. Kh2 N
f4 22. Rc2 cxd5 23. exd5 h4 24. Bg4 Rce8 25. Bb2 g6 26. Nd4 exd4 27. Rxf4 Bd6  0
:1
Starting position...
Search deep 1: d2d4
Chess openings (first move)
e2e4 (5) d2d4 (3) b1c3 (1) b2b3 (1) b2b4 (1) c2c4 (1) f2f4 (1) g1f3 (1) g2g3 (1)

After: 1.e4 e5 2.Nf3 opening
b8c6 (8) d7d6 (1) f7f5 (1) g8f6 (1) ECO C44
Welcome, have a nice day!