A quick puzzle.

Using a standard chess set, how many knights can you place on the board so that no knight attacks another?

32

A standard chess set has only 2 black and 2 white knights. Therefore: 4 😛

32, unless colour is relevant, in which case it is 64 white or 64 black knights. And of course, not being limited by the amount of knights that actually can be obtained during a chess game.

If we do take into account N promotions during a legal game, the answer is 20. Pawns are turned on their side to represent promoted Knights.

Originally posted by BigDoggProblem
If we do take into account N promotions during a legal game, the answer is 20. Pawns are turned on their side to represent promoted Knights.

You can never promote all 16 pawns though.

sure you can!

Originally posted by TheMaster37
You can never promote all 16 pawns though.

Why, TheStudent37, that just shows a lack of imagination.

Something like this:

1. a4 h5 2. a5 h4 3. a6 h3 4. g4 b5 5. Bg2 hxg2 6. h4 Bb7 7. axb7 a5 8. Ra4 bxa4 9. b4 Rh5 10. gxh5 g5 11. h6 g4 12. h7 g3 13. h8=N e5 14. b5 Na6 15. b8=N Nb4 16. b6 Nh6 17. b7 c5 18. Rh3 f5 19. Nf3 f4 20. e4 Ke7 21. d4 Ke6 22. Nc3 Ra6 23. Nb5 Rc6 24. d5+ Kf6 25. dxc6 g1=N 26. Kd2 g2 27. Nfd4 a3 28. c7 a2 29. c8=N a1=N 30. h5 Kg5 31. f3 a4 32. Rg3+ fxg3 33. f4+ Kh4 34. Kc3 Bg7 35. f5 Nh3 36. Bf4 exf4 37. e5 g1=N 38. Kc4 a3 39. Na6 a2 40. Nba7 f3 41. Kb5 c4 42. Ndc6 c3 43. Qd2 cxd2 44. c4 d1=N 45. e6 d5 46. e7 d4 47. exd8=N Nac2 48. b8=N a1=N 49. c5 Na2 50. N8e7 d3 51. f6 f2 52. fxg7 f1=N 53. g8=N Ne2 54. Nhf7 Ng4 55. h6 d2 56. h7 Ndf2 57. h8=N d1=N 58. Na5 g2 59. c6 g1=N 60. c7 Ngh2 61. c8=N

Originally posted by Mephisto2

[fen]1NNN2NN/N3NN2/N7/NK6/7k/7n/n1n1nn1n/n2n1nn1 b - - 0 61[/fen]

😀 😀 😀

Originally posted by Mephisto2
Something like this:

1. a4 h5 2. a5 h4 3. a6 h3 4. g4 b5 5. Bg2 hxg2 6. h4 Bb7 7. axb7 a5 8. Ra4 bxa4 9. b4 Rh5 10. gxh5 g5 11. h6 g4 12. h7 g3 13. h8=N e5 14. b5 Na6 15. b8=N Nb4 16. b6 Nh6 17. b7 c5 18. Rh3 f5 19. Nf3 f4 20. e4 Ke7 21. d4 Ke6 22. Nc3 Ra6 23. Nb5 Rc6 24. d5+ Kf6 25. dxc6 g1=N 26. Kd2 g2 27. Nfd4 a3 28. c7 a2 29. c8=N a1=N 30. h5 Kg5 31 ...[text shortened]... 54. Nhf7 Ng4 55. h6 d2 56. h7 Ndf2 57. h8=N d1=N 58. Na5 g2 59. c6 g1=N 60. c7 Ngh2 61. c8=N

Is it possible to construct a game that reaches 10 black knights and 10 white knights only (no other pieces except kings) without ever having a knight attack another knight?

Originally posted by XanthosNZ
Is it possible to construct a game that reaches 10 black knights and 10 white knights only (no other pieces except kings) without ever having a knight attack another knight?

Why not?

1. a4 h5 2. e4 e5 3. Qg4 hxg4 4. Ba6 bxa6 5. b4 d5 6. h4 c5 7. h5 Bd7 8. h6 Bb5 9. axb5 a5 10. b6 a4 11. b7 a3 12. b5 a2 13. b6 a6 14. h7 a5 15. Ba3 f5 16. Bb4 cxb4 17. c4 b3 18. c5 b2 19. c6 d4 20. c7 g5 21. Rh3 d3 22. Rf3 Bc5 23. Rf4 exf4 24. Na3 Nd7 25. Nb5 Ndf6 26. Na7 Nh5 27. Ne2 Nh6 28. Nc3 Ng3 29. Ncb5 Nh1 30. Rc1 Rg8 31. h8=N f3 32. Rc2 dxc2 33. d4 g3 34. Kd2 Ke7 35. Kc3 Kf6 36. d5 Be3 37. fxe3 f2 38. d6 g4 39. e5+ Kg5 40. e6 Qf6+ 41. Kc4 Qe5 42. e4 Raf8 43. b8=N Kh4 44. c8=N Qf4 45. e7 Qf3 46. gxf3 g2 47. e5 Rf6 48. e8=N g1=N 49. e6 g3 50. e7 Re6 51. d7 Ng4 52. Nbc7 Re4+ 53. fxe4 a4 54. e5 f1=N 55. Na8 Ngf2 56. b7 Nd1 57. Nbc6 f4 58. b8=N g2 59. d8=N Rf8 60. exf8=N Ne2 61. N6e7 g1=N 62. Ng8 f3 63. Nef6 f2 64. N6h7 Nd2+ 65. Kd5 f1=N 66. e6 a1=N 67. e7 b1=N 68. e8=N a3 69. Kd6 c1=N 70. Ke7 Nc2 71. Kd7 a2 72. Ke7 a1=N 73. Kd7 Kg3 74. Ke7 Kf2 75. Kd7 Ne1 76. Ke7 Ndf3 77. Kd7 Nec3 78. Ke7 Ke2 79. Kd7 N3a2 80. Ke7 N3h2

beautiful 🙂)

Originally posted by Mephisto2
Why not?

1. a4 h5 2. e4 e5 3. Qg4 hxg4 4. Ba6 bxa6 5. b4 d5 6. h4 c5 7. h5 Bd7 8. h6 Bb5 9. axb5 a5 10. b6 a4 11. b7 a3 12. b5 a2 13. b6 a6 14. h7 a5 15. Ba3 f5 16. Bb4 cxb4 17. c4 b3 18. c5 b2 19. c6 d4 20. c7 g5 21. Rh3 d3 22. Rf3 Bc5 23. Rf4 exf4 24. Na3 Nd7 25. Nb5 Ndf6 26. Na7 Nh5 27. Ne2 Nh6 28. Nc3 Ng3 29. Ncb5 Nh1 30. Rc1 Rg8 31. h8=N f3 32. Rc2 ...[text shortened]... Kd7 Kg3 74. Ke7 Kf2 75. Kd7 Ne1 76. Ke7 Ndf3 77. Kd7 Nec3 78. Ke7 Ke2 79. Kd7 N3a2 80. Ke7 N3h2

Nice game!
Is it a draw?

Originally posted by FabianFnas
Nice game!
Is it a draw?

Probably both players would agree on a draw. It would be a nightmare to play this out and try to win, and if one did, the mistakes on either side would determine the outcome.