How many moves to mate?
Moderator: Ras
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chessica
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- Full name: Esmeralda Pinto
How many moves to mate?
[fen]5K1k/1R1P4/8/b7/4r3/3B4/3p4/8 w - - 0 1 [/fen]
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Jouni
- Posts: 3766
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- Full name: Jouni Uski
Re: How many moves to mate?
Analysis by The Huntsman 1:
1.d8N Re8+ 2.Kxe8 d1Q 3.Kf8 Qxd3 4.Nf7+ Kh7 5.Ne5+ Kh6 6.Nxd3 Kg6 7.Ke7 Kf5 8.Rb5+ Ke4 9.Nf2+ Ke3 10.Rxa5 Kxf2 11.Re5 Kf3 12.Ke6 Kg4 13.Rf5 Kg3 14.Kf6 Kg2 15.Kg6 Kh2 16.Rg5 Kh1 17.Kh5 Kh2 18.Kh4 Kh1 19.Kg3 Kg1 20.Rf5 Kh1 21.Rf1#
+- (#21) Depth: 74/42 00:00:01 19849kN
1.d8N Re8+ 2.Kxe8 d1Q 3.Kf8 Qxd3 4.Nf7+ Kh7 5.Ne5+ Kh6 6.Nxd3 Kg6 7.Ke7 Kf5 8.Rb5+ Ke4 9.Nf2+ Ke3 10.Rxa5 Kxf2 11.Re5 Kf3 12.Ke6 Kg4 13.Rf5 Kg3 14.Kf6 Kg2 15.Kg6 Kh2 16.Rg5 Kh1 17.Kh5 Kh2 18.Kh4 Kh1 19.Kg3 Kg1 20.Rf5 Kh1 21.Rf1#
+- (#21) Depth: 74/42 00:00:01 19849kN
Jouni
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peter
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Re: How many moves to mate?
20.
1.d8N Re8+ 2.Kxe8 d1Q 3.Kf8 Qxd3 is #17 according to 6men tbs.
Peter.
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Ajedrecista
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Re: How many moves to mate?
Hello:
This problem is from 1999 according to YACPDB:
https://yacpdb.org/#285776
Whose solution gives shorter checkmates after black suboptimal moves. Here is the PGN taken from this page:
[pgn][Event "Studium"]
[Site ""]
[Date "1999"]
[Round ""]
[White "Stavrietsky,A/Ryabinin,N"]
[Black "
[+0440.11f8h8"]
[Result "1-0"]
[SetUp "1"]
[FEN "5K1k/1R1P4/8/b7/4r3/3B4/3p4/8 w - - 0 1"]
[PlyCount "15"]
[EventDate "1999"]
1. d8=N (1. d8=Q $2 Rf4+ $1 $11 (1... Bxd8 $2 2. Bxe4 Be7+ 3. Rxe7 d1=Q 4. Rh7# ) 2. Rf7 Rxf7+ 3. Kxf7+ Bxd8 4. Bc2) (1. Bc2 $2 Rf4+ 2. Ke7 Rf1 $11) (1. Rb1 $2 Re1 2. Rb2 $8 (2. Rb5 $2 d1=Q) (2. Rb8 $2 Rf1+ $19 3. Ke7+ (3. Bxf1 d1=Q) 3... Kg7 4. Bc2 Re1+ 5. Kd6 Rc1) 2... Rg1 $11 (2... Bc7 3. Rxd2 Bd6+ 4. Kf7 Re7+ $11 5. Kf6 (5. Kg6 Rg7+ (5... Rxd7)) 5... Rxd7) 3. Bf5 (3. Be2) (3. Bc2) 3... Rf1 4. Rxd2 Rxf5+ 5. Ke7) 1... Re8+ (1... Rf4+ 2. Nf7+ Rxf7+ 3. Kxf7 (3. Rxf7 $4 Bb4+ (3... d1=Q $4 4. Rh7#) 4. Ke8 d1=Q $19) 3... d1=Q 4. Rb8+ Bd8 5. Rxd8#) ( 1... d1=Q 2. Nf7+ Kh7 3. Bxe4#) (1... Bxd8 2. Bxe4 Be7+ 3. Rxe7 d1=Q 4. Rh7#) ( 1... Bb4+ 2. Rxb4 $18 Re8+ 3. Kf7 Re7+ 4. Kf6 (4. Kg6) (4. Kxe7)) 2. Kxe8 (2. Kf7 $2 d1=Q) 2... d1=Q 3. Kf8 Bb4+ (3... Qxd3 4. Nf7+ Kh7 5. Ne5+ $18) 4. Rxb4 (4. Ke8 $2 Qh5+ 5. Nf7+ Kg7 $17) 4... Qf3+ (4... Qxd3 5. Rh4+ Qh7 6. Nf7#) 5. Bf5 (5. Nf7+ $2 Qxf7+ 6. Kxf7 $10 {pat}) 5... Qxf5+ (5... Qh5 6. Rh4 Qxh4 7. Nf7#) 6. Nf7+ Kh7 7. Rh4+ Kg6 8. Rh6# 1-0[/pgn]
The problem is also featured in a PDF of the same event (study 3 at pages 2 and 4). A chess problems blog says that this study was solved by only 35% of the solvers of that contest.
Regards from Spain.
Ajedrecista.
It is a checkmate in 20 moves according to Chest database. The best (longer) line analysing with SF 15.1 starts with: 1.- d8=N, Re8+; 2.- Kxe8, d1=Q; 3.- Kf8, Qxd3 and we have a 6-man endgame which is a checkmate in 17 moves starting with 4.- Nf7+, Kh7; 5.- Ne5+.
This problem is from 1999 according to YACPDB:
https://yacpdb.org/#285776
Whose solution gives shorter checkmates after black suboptimal moves. Here is the PGN taken from this page:
[pgn][Event "Studium"]
[Site ""]
[Date "1999"]
[Round ""]
[White "Stavrietsky,A/Ryabinin,N"]
[Black "
[+0440.11f8h8"]
[Result "1-0"]
[SetUp "1"]
[FEN "5K1k/1R1P4/8/b7/4r3/3B4/3p4/8 w - - 0 1"]
[PlyCount "15"]
[EventDate "1999"]
1. d8=N (1. d8=Q $2 Rf4+ $1 $11 (1... Bxd8 $2 2. Bxe4 Be7+ 3. Rxe7 d1=Q 4. Rh7# ) 2. Rf7 Rxf7+ 3. Kxf7+ Bxd8 4. Bc2) (1. Bc2 $2 Rf4+ 2. Ke7 Rf1 $11) (1. Rb1 $2 Re1 2. Rb2 $8 (2. Rb5 $2 d1=Q) (2. Rb8 $2 Rf1+ $19 3. Ke7+ (3. Bxf1 d1=Q) 3... Kg7 4. Bc2 Re1+ 5. Kd6 Rc1) 2... Rg1 $11 (2... Bc7 3. Rxd2 Bd6+ 4. Kf7 Re7+ $11 5. Kf6 (5. Kg6 Rg7+ (5... Rxd7)) 5... Rxd7) 3. Bf5 (3. Be2) (3. Bc2) 3... Rf1 4. Rxd2 Rxf5+ 5. Ke7) 1... Re8+ (1... Rf4+ 2. Nf7+ Rxf7+ 3. Kxf7 (3. Rxf7 $4 Bb4+ (3... d1=Q $4 4. Rh7#) 4. Ke8 d1=Q $19) 3... d1=Q 4. Rb8+ Bd8 5. Rxd8#) ( 1... d1=Q 2. Nf7+ Kh7 3. Bxe4#) (1... Bxd8 2. Bxe4 Be7+ 3. Rxe7 d1=Q 4. Rh7#) ( 1... Bb4+ 2. Rxb4 $18 Re8+ 3. Kf7 Re7+ 4. Kf6 (4. Kg6) (4. Kxe7)) 2. Kxe8 (2. Kf7 $2 d1=Q) 2... d1=Q 3. Kf8 Bb4+ (3... Qxd3 4. Nf7+ Kh7 5. Ne5+ $18) 4. Rxb4 (4. Ke8 $2 Qh5+ 5. Nf7+ Kg7 $17) 4... Qf3+ (4... Qxd3 5. Rh4+ Qh7 6. Nf7#) 5. Bf5 (5. Nf7+ $2 Qxf7+ 6. Kxf7 $10 {pat}) 5... Qxf5+ (5... Qh5 6. Rh4 Qxh4 7. Nf7#) 6. Nf7+ Kh7 7. Rh4+ Kg6 8. Rh6# 1-0[/pgn]
The problem is also featured in a PDF of the same event (study 3 at pages 2 and 4). A chess problems blog says that this study was solved by only 35% of the solvers of that contest.
Regards from Spain.
Ajedrecista.