(and btw, how do I format in fixed font?)
It seems you can select the font size and color and style, but not the font itself. So you can't avoid a proportional font or having <enter> produce double spacing. If you type in 10 zeroes and 10 ones and 10 O's and 10 I's, with the groups separated by <enter>, it comes out like this.
0000000000
1111111111
OOOOOOOOOO
IIIIIIIIII
#1067
Proof game
[#1084]
These are supposed to be legal positions. There's another thread where you can post an illegal position and challenge others to explain why it's illegal.
#1084
The white king had no path to a8.
#1073
Shorter
so many illegal reasons, that could have a record (#1084)
How many reasons are there for the position to be illegal? I see two main things. The white king can't reach a8, as tygxc said. And none of the bishops can reach the squares they're on. If you put the white king somewhere it can get to and remove the bishops, the position is legal. Here's an unshortened proof game.
#1091
If the bishops were at c8 and f8 then it would be possible to get there by promoting the c- and f-pawns.
If pawn h7 were lacking, then the white king would be able to get to a8.
This position is legal:
#1091
If the bishops were at c8 and f8 then it would be possible to get there by promoting the c- and f-pawns.
If pawn h7 were lacking, then the white king would be able to get to a8.
Let's look at the original position with the white bishops moved to c8 and f8 and the h7 pawn removed. Are you suggesting it would make the position legal?
#1093
No, you still have to remove 2 bishops: either both black or both white or one white and one black.
illegal reasons counter is the number of pieces (least for the position) you need to move/remove/add to the position to make it legal
#1095
Very nice.
I think it is shortest indeed: no way to improve on black's moves.
#1098
In addition I tried to make long sequences of consecutive moves by the same piece, which I find aesthetically pleasing.
Can anyone improve on the number (29+21=50) of consecutive moves by the same piece in a shortest proof game? (and btw, how do I format in fixed font?)
Move_0_________1_________2_________3_________4________Total
White__23_5_78_0__34_67890_234_____0____5678_01234567_29
Black___345_______34567_____3____8__1__4567_9_12_456__21
1. Nf3 Na6 2. *Nd4 Nh6 3. *Nc6 *Nf5 4. g4 *Nd4 5. *g5 *Nb3 6. Rg1 dxc6 7. *Rg4 Qd3 8. *Rb4 Be6 9. g6 Kd7 10. *gxf7 g5 11. Rb6 Bg7 12. f8=R g4 13. *Rf4 *g3 14. *Ra4 *g2 15. f4 *g1=R 16. *f5 *Rg5 17. *f6 *Rb5 18. *f7 Bc4 19. *f8=R Nac5 20. *Rf4 axb6 21. exd3 Raa5 22. *dxc4 Rha8 23. *cxb5 *R8a6 24. *bxa6 Bc3 25. Bb5 cxb5 26. Rfb4 Kc6 27. dxc3 bxa4 28. axb3 *a3 29. Be3 Na4 30. *Bc5 a2 31. a7 *axb1=B 32. Ra3 Ra6 33. Qd6+ exd6 34. Ke2 *dxc5 35. *Kd3 *cxb4 36. *Kc4 *bxa3 37. *Kb4 *a2 38. *Ka3 Kb5 39. h3 *Ka5 40. *h4 Nc5 41. *h5 *Ne6 42. *h6 *Ng7 43. *hxg7 h6 44. *g8=N *h5 45. *Nf6 *h4 46. *Nd7 *h3 47. *Nb8