Not logged inRybka Chess Community Forum
Up Topic The Rybka Lounge / Test Positions / Desperado Rook or mate?
- - By InspectorGadget (*****) [za] Date 2017-10-11 09:35
8/2ppppp1/rpR4k/8/8/6p1/5pP1/7K b - - 0 1


I came across this position. From my human eye, this is clearly a draw. asmFish says it's a mate in 18 moves. I think Komodo also says so. Can anyone confirm a mate?
Parent - - By Peter Grayson (****) [us] Date 2017-10-11 13:09
It  is very subtle. Black has to avoid giving stalemate and forces the game to a point when the B pawn can either be moved or has to be taken. Either way paves the path to preventing White playing Rh6 check because then Black plays Rxh6 mate.

PeterG

[Event "?"]
[Site "?"]
[Date "2017.10.11"]
[Round "?"]
[White "Bug in code"]
[Black "?"]
[Result "0-1"]
[SetUp "1"]
[FEN "8/2ppppp1/rpR4k/8/8/6p1/5pP1/7K b - - 0 1"]
[PlyCount "35"]

1... d6 2. Rxd6+ f6 3. Rxf6+ Kh7 4. Rh6+ Kg8 5. Rh8+ Kf7 6. Rf8+ Ke6 7. Rf6+
Kd7 8. Rd6+ Kc8 9. Rd1 (9. Rd8+ $4 {[%emt 0:00:00]} Kb7 {[%emt 0:00:00]} 10.
Rb8+ {[%eval -32751,96] [%emt 0:00:15]} Kc6 {[%emt 0:00:20]} 11. Rxb6+ {[%eval
-32753,105] [%emt 0:00:00]} Kd7 {[%emt 0:00:09]} 12. Rd6+ {[%eval -32755,118]
[%emt 0:00:00]} Ke8 {[%emt 0:00:24]} 13. Rd8+ {[%eval -32757,127] [%emt 0:00:
00]} Kf7 {[%emt 0:00:01]} 14. Rf8+ {[%eval -32759,127] [%emt 0:00:00]} Kg6 {
[%emt 0:00:01]} 15. Rf6+ {[%eval -32761,127] [%emt 0:00:00]} Kh7 {[%emt 0:00:
02]} 16. Rxf2 {[%eval -32763,127] [%emt 0:00:00]} Ra1+ {[%emt 0:00:13]} 17. Rf1
{[%eval -32765,127] [%emt 0:00:00]} Rxf1# {[%emt 0:00:03]}) 9... b5 10. Rd8+
Kb7 11. Rb8+ Kc6 12. Rb6+ Kd7 13. Rd6+ Ke8 14. Rd8+ Kf7 15. Rf8+ Kg6 16. Rf6+
Kh7 17. Rxf2 {[%emt 0:00:00]} (17. Rh6+ {[%emt 0:00:00]} Rxh6# {[%eval -32765,
127] [%emt 0:00:00]}) 17... Ra1+ {[%eval -32763,127] [%emt 0:00:00]} 18. Rf1 {
[%emt 0:00:20]} Rxf1# {[%eval -32765,127] [%emt 0:00:00]} 0-1
Parent - By InspectorGadget (*****) [za] Date 2017-10-11 19:50
Hi Peter.I checked again in the evening when I got home. Indeed it is a mate. When that pawn on b6 gets captured it opens up for a black rook. It is subtle :smile:
Up Topic The Rybka Lounge / Test Positions / Desperado Rook or mate?

Powered by mwForum 2.27.4 © 1999-2012 Markus Wichitill