thanks Joerg.Joerg Oster wrote:Why don't you check yourself?Lyudmil Tsvetkov wrote:I can not go check each and every tbs position whether is a longer or shorter than 50 mate. The general rule say BB vs N 66 moves longest mate, there are shorter mates of course. the point was to demonstrate that SF is able to deliver mate on its own in such positions, so why deprive it of a well-deserved win?syzygy wrote:Yes, one side to this discussion is rather unwilling to understand the stuff he's talking about.Evert wrote:I'm not sure what point you think you're making?Lyudmil Tsvetkov wrote:[d]8/4n3/4k3/8/8/4K1B1/2B5/8 w - - 0 1
why instruct the engine above position is a draw, when SF finds mate very quickly even at bullet?
The position is apparently mate in 43 moves (starting with 1. Bb3+), so the 50 move rule is irrelevant even if the knight is not captured (which I haven't checked). Source: Nalimov tables from http://www.k4it.de/?topic=egtb&lang=en.
https://syzygy-tables.info/?fen=8/4n3/4 ... _w_-_-_0_1
DTZ=59, so white can force a mate or winning capture in under 30 moves.
If this were impossible to win within the 50-move rule, SF would be expected not to find a mate in the first place. After all, SF knows about and accepts the 50-move rule.
do not have quick access as well as the time to check tbs now, I hope you will help out with this, but here is a position I presume is longer than 50 mate:
[d]2kb4/1b6/8/8/3Q4/8/8/4K3 w - - 0 1
actually, a variation of the TCEC game
I presume SF will be able to deliver mate on its own above at blitz TC, will it not?
Is somebody able to check this?
Here https://syzygy-tables.info/ you can insert the FEN of the position you want to know,
and you get all information you need.
You can even download the full PGN of the main dtz winning line.Code: Select all
[Event ""] [Site "http://syzygy-tables.info/?fen=2kb4/1b6/8/8/3Q4/8/8/4K3_w_-_-_0_1"] [Date "2016.11.25"] [White "Syzygy"] [Black "Syzygy"] [Result "1-0"] [SetUp "1"] [FEN "2kb4/1b6/8/8/3Q4/8/8/4K3 w - - 0 1"] [Annotator "syzygy-tables.info"] { DTZ 43 } 1. Qd6 Bc7 2. Qe6+ Kd8 3. Kd2 Bc8 4. Qc6 Bd7 5. Qf6+ Kc8 6. Kc3 Kb7 7. Kc4 Bb6 8. Kd5 Bb5 9. Qe7+ Ka6 10. Kd6 Ba7 11. Kc7 Bb6+ 12. Kb8 Bc4 13. Qb4 Bb5 14. Qa3+ Ba5 15. Qb3 Bb6 16. Qa2+ Ba5 17. Qd5 Bb4 18. Qb7+ Ka5 19. Qa7+ Ba6 20. Kc7 Kb5 21. Qb6+ Ka4 22. Qxa6+ { KQvKB with DTZ -16 } 22... Kb3 23. Qd3+ Kb2 24. Kb6 Bc3 25. Kb5 Kb3 26. Kc5 Kb2 27. Kc4 Ba5 28. Qb3+ Ka1 29. Qa3+ Kb1 30. Qxa5 { KQvK with DTZ -6 } 30... Kb2 31. Qd2+ Ka1 32. Kb3 Kb1 33. Qb2# { Checkmate } 1-0
because in that case there will be no one to ask questions and suggest new rules...
I have another request for you or anyone else capable of helping:
[d]K5Q1/8/8/8/5bb1/6k1/8/8 w - - 0 1
this already should be tbs win in more than 50.
is SF able to deliver mate in blitz mode without tbs?