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# Mate in ___ - longest mate wins!

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magipi wrote:
lolpro11 wrote:
JamieKowalski wrote:

Mate in 1140:

for which side?

I am surprised nobody posted this LEGIT one in almost 10 years.  Mate in 271!

If Black ever moves the Knight, it is game over in a few moves with Bxf3.  The White King cannot be allowed in a6.  The Black King must toggle between a8 and b7 or c8 and b7.  It cannot triangulate and so it cannot lose a tempo.  If it were Black to move, he wins with 1...d3.  It is White to move though, and after 1 Bishop move and pawn move by Black, he must lose a tempo.

1.Bb1 h4 2.Ka4 (2.Ba2?? d3-+) Ka8 3.Ka3 Kb7 4.Ka2 Ka8 5.Ka1 Kb7 6.Ba2 Ka8 7.Kb1 Kb7 8.Kc1 Ka8 9.Kd1 Kb7 10.Ke1 Ka8 11.Kf1 Kb7 12.Kf2 Ka8 13.Ke1 Kb7 14.Kd1 Ka8 15.Kc1 Kb7 16.Kb1 Ka8 17.Ka1 Kb7 18.Bb1 Ka8 19.Ka2 Kb7 20.Ka3 Ka8 21.Ka4 Kb7 22.Ka5.

Now Black must move a pawn, either f- or h-.

Repeat process until Black is forced to either

A) Move the d-pawn with Bishop on b1

B) Move the Knight, which loses to Bxf3+

C) Move the King, which loses to Ka6.

Longest Black can go is 271 moves.

ThrillerFan wrote:
...lolpro11 wrote:
JamieKowalski wrote:

Mate in 1140:

for which side?

I am surprised nobody posted this LEGIT one in almost 10 years.  Mate in 271!

...

Ten years ago, there were several posts all on the same subject.

Here's a link to one site that discusses some of the longest possible forced mates if we disregard the 50 and 75 move draw rules:

https://chess.stackexchange.com/questions/13178/what-is-the-longest-forced-win-with-3-to-6-pieces-ignoring-50-75-move-rules#:~:text=Longest%20known%20checkmate%20is%20in,can%20see%20the%20game%20here.&text=is%20not%20useful-,Show%20activity%20on%20this%20post.,is%20a%20mate%20in%20549.

And here's a link to a thread on the longest checkmate known so far that incorporates the 50 and 75 move draw rules:

https://chess.stackexchange.com/questions/21723/what-is-the-longest-proven-forced-win-including-50-75-move-rules?noredirect=1&lq=1

Mate in 186

Is that really all forced?

The longest mate is by Otto Blathy, and I think it might be about 290 moves.

There are endgame studies that range much longer, but are unfortunately cut short by the 50 move rule.

mate in 549

400 moves

fianchetto123 wrote:

Who can find the mate in the most moves?

Note: Don't post unless you're setting a record! If you want to post your puzzle please post it before someone breaks that record.

To start off here is a mate in 1. Hopefully someone will come up with a longer one than this!

I solved it here (m100)

[Event "?"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "?"]
[Black "?"]
[Result "1-0"]
[SetUp "1"]
[FEN "8/8/8/8/8/8/3R4/R3K1k1 w Q - 0 1"]

1. Raa2 Kh1 2. Ra3 Kg1 3. Ra4 Kh1 4. Ra5 Kg1 5. Ra6 Kh1 6. Ra7 Kg1 7. Ra8 Kh1 8.
Rb8 Kg1 9. Rb7 Kh1 10. Rb6 Kg1 11. Rb5 Kh1 12. Rb4 Kg1 13. Rb3 Kh1 14. Rbb2 Kg1
15. Rb1 Kh1 16. Rc1 Kg1 17. Rcc2 Kh1 18. Rc3 Kg1 19. Rc4 Kh1 20. Rc5 Kg1 21. Rc6
Kh1 22. Rc7 Kg1 23. Rc8 Kh1 24. Rcd8 Kg1 25. R8d7 Kh1 26. R7d6 Kg1 27. R6d5 Kh1
28. R5d4 Kg1 29. R4d3 Kh1 30. Re3 Kg1 31. Ree2 Kh1 32. Re4 Kg1 33. Re5 Kh1 34.
Re6 Kg1 35. Re7 Kh1 36. Re8 Kg1 37. Rf8 Kh1 38. Rf7 Kg1 39. Rf6 Kh1 40. Rf5 Kg1
41. Rf4 Kh1 42. Rf3 Kg1 43. Rff2 Kh1 44. Rde2 Kg1 45. Re7 Kh1 46. Re6 Kg1 47.
Re5 Kh1 48. Re4 Kg1 49. Re8 Kh1 50. Rh2+ Kxh2 51. Kf2 Kh3 52. Kf3 Kh2 53. Kf4
Kg2 54. Re7 Kf2 55. Re6 Kg2 56. Re5 Kf2 57. Re4 Kg2 58. Re3 Kf2 59. Re4 Kg2 60.
Kg4 Kf2 61. Rf4+ Ke2 62. Rf5 Kd3 63. Rf6 Ke3 64. Rf7 Kd4 65. Rf8 Kd5 66. Rf1 Kd4
67. Rf2 Kd3 68. Rf3+ Ke4 69. Kg3 Kd5 70. Re3 Kc4 71. Kf4 Kd4 72. Re4+ Kd3 73.
Kf3 Kd2 74. Rd4+ Kc2 75. Ke3 Kc3 76. Rd3+ Kc4 77. Rd4+ Kc5 78. Ke4 Kc6 79. Rc4+
Kd6 80. Rd4+ Ke6 81. Rd5 Kf6 82. Rd6+ Ke7 83. Ke5 Kf7 84. Rd7+ Kg6 85. Re7 Kg5
86. Rg7+ Kh5 87. Kf5 Kh4 88. Rg5 Kh3 89. Kf4 Kh2 90. Rg3 Kh1 91. Kf3 Kh2 92. Kf2
Kh1 93. Rf3 Kh2 94. Re3 Kh1 95. Rd3 Kh2 96. Rc3 Kh1 97. Rb3 Kh2 98. Rg3 Kh1 99.
Rg8 Kh2 100. Rh8# 1-0