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If a pawn promotes to a checking piece while also revealing a check, it is a double check?
Is there a chess engine with divide perft for captures only?C++ vs Java Engine move generation performancePossible chess positon after X ply?Getting started in position-counting by computerHow to write a simple chess engine to statically evaluate a position?How can minimax chess engines do alpha-beta pruning without reaching the final positions?What is the longest possible sequence of double checks?
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I'm writing a chess engine just for fun, and during the validation of movement generation, I found some positions in Perft Results that differ from what my engine is producing.
As an example, take the below position.
[FEN "r3k2r/p1ppqpb1/bn2pnp1/3PN3/1p2P3/2N2Q1p/PPPBBPPP/R3K2R w KQkq - 0 1"]
I found in the Chess programming wiki, the number of possible positions in depth 5 is 193690690, and my program matches this value.
However, regarding the number of possible double checks, my program found 8 more positions. The Perft Results from the Wiki indicate a total of 2637, while I found 2645.
I don't know what to think. Maybe the Perft Result from the Wiki does not consider positions where a pawn promotes with check whilst revealing a check, aka a discovered check. But there are only 6 moves where a pawn promotion results in a double check (3 positions, where the pawn may promote to queen or rook). Are the positions from Wiki wrong?
If someone wants to look at the positions, they can be found here on Google Drive.
engines programming pawn-promotion performance double-check
asked 11 hours ago
Welyab PaulaWelyab Paula
363 bronze badges
add a comment
|
I'm writing a chess engine just for fun, and during the validation of movement generation, I found some positions in Perft Results that differ from what my engine is producing.
As an example, take the below position.
[FEN "r3k2r/p1ppqpb1/bn2pnp1/3PN3/1p2P3/2N2Q1p/PPPBBPPP/R3K2R w KQkq - 0 1"]
I found in the Chess programming wiki, the number of possible positions in depth 5 is 193690690, and my program matches this value.
However, regarding the number of possible double checks, my program found 8 more positions. The Perft Results from the Wiki indicate a total of 2637, while I found 2645.
I don't know what to think. Maybe the Perft Result from the Wiki does not consider positions where a pawn promotes with check whilst revealing a check, aka a discovered check. But there are only 6 moves where a pawn promotion results in a double check (3 positions, where the pawn may promote to queen or rook). Are the positions from Wiki wrong?
If someone wants to look at the positions, they can be found here on Google Drive.
engines programming pawn-promotion performance double-check
asked 11 hours ago
Welyab PaulaWelyab Paula
363 bronze badges
add a comment
|
I'm writing a chess engine just for fun, and during the validation of movement generation, I found some positions in Perft Results that differ from what my engine is producing.
As an example, take the below position.
[FEN "r3k2r/p1ppqpb1/bn2pnp1/3PN3/1p2P3/2N2Q1p/PPPBBPPP/R3K2R w KQkq - 0 1"]
I found in the Chess programming wiki, the number of possible positions in depth 5 is 193690690, and my program matches this value.
However, regarding the number of possible double checks, my program found 8 more positions. The Perft Results from the Wiki indicate a total of 2637, while I found 2645.
I don't know what to think. Maybe the Perft Result from the Wiki does not consider positions where a pawn promotes with check whilst revealing a check, aka a discovered check. But there are only 6 moves where a pawn promotion results in a double check (3 positions, where the pawn may promote to queen or rook). Are the positions from Wiki wrong?
If someone wants to look at the positions, they can be found here on Google Drive.
engines programming pawn-promotion performance double-check
asked 11 hours ago
Welyab PaulaWelyab Paula
363 bronze badges
I'm writing a chess engine just for fun, and during the validation of movement generation, I found some positions in Perft Results that differ from what my engine is producing.
As an example, take the below position.
[FEN "r3k2r/p1ppqpb1/bn2pnp1/3PN3/1p2P3/2N2Q1p/PPPBBPPP/R3K2R w KQkq - 0 1"]
I found in the Chess programming wiki, the number of possible positions in depth 5 is 193690690, and my program matches this value.
However, regarding the number of possible double checks, my program found 8 more positions. The Perft Results from the Wiki indicate a total of 2637, while I found 2645.
I don't know what to think. Maybe the Perft Result from the Wiki does not consider positions where a pawn promotes with check whilst revealing a check, aka a discovered check. But there are only 6 moves where a pawn promotion results in a double check (3 positions, where the pawn may promote to queen or rook). Are the positions from Wiki wrong?
If someone wants to look at the positions, they can be found here on Google Drive.
engines programming pawn-promotion performance double-check
engines programming pawn-promotion performance double-check
asked 11 hours ago
Welyab PaulaWelyab Paula
363 bronze badges
asked 11 hours ago
Welyab PaulaWelyab Paula
363 bronze badges
edited 1 hour ago
Welyab Paula
asked 11 hours ago
Welyab PaulaWelyab Paula
363 bronze badges
asked 11 hours ago
Welyab PaulaWelyab Paula
363 bronze badges
asked 11 hours ago
Welyab PaulaWelyab Paula
363 bronze badges
363 bronze badges
add a comment
|
add a comment
|
2 Answers
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Yes, a double check is when two pieces give check at the same time. It doesn't matter how you got to that position. As to whether there's an error on that wiki, it's probably best to try to ask its author. Maybe they can provide the full list of positions for you to compare.
I can think of two ways of giving double check while promoting. One is where you have say the black king in front of the white pawn, and a white queen or rook behind the pawn, and the pawn promotes with a capture, ending up as a new white queen or rook next to the black king. The other is where say the black king is on the seventh rank, white has a rook or queen on the other side of the pawn, and White promotes to a knight, queen or bishop giving check.
answered 10 hours ago
itubitub
5,5271 gold badge13 silver badges33 bronze badges
Thank you for the feedback. The author of perft results is Peter McKenzie, worker of Google. I found him LinkedIn profile and send him a message. Maybe he can answer me.
– Welyab Paula
1 hour ago
add a comment
|
Yes, the case you mentioned would also qualify as a double check.
But it also depends on what your definitions are. If the Perft result does consider that to not be a double check, it doesn't mean you have to abide by it.
answered 1 hour ago
Inertial IgnoranceInertial Ignorance
6,9445 silver badges16 bronze badges
add a comment
|
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2 Answers
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active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
Yes, a double check is when two pieces give check at the same time. It doesn't matter how you got to that position. As to whether there's an error on that wiki, it's probably best to try to ask its author. Maybe they can provide the full list of positions for you to compare.
I can think of two ways of giving double check while promoting. One is where you have say the black king in front of the white pawn, and a white queen or rook behind the pawn, and the pawn promotes with a capture, ending up as a new white queen or rook next to the black king. The other is where say the black king is on the seventh rank, white has a rook or queen on the other side of the pawn, and White promotes to a knight, queen or bishop giving check.
answered 10 hours ago
itubitub
5,5271 gold badge13 silver badges33 bronze badges
Thank you for the feedback. The author of perft results is Peter McKenzie, worker of Google. I found him LinkedIn profile and send him a message. Maybe he can answer me.
– Welyab Paula
1 hour ago
add a comment
|
Yes, a double check is when two pieces give check at the same time. It doesn't matter how you got to that position. As to whether there's an error on that wiki, it's probably best to try to ask its author. Maybe they can provide the full list of positions for you to compare.
I can think of two ways of giving double check while promoting. One is where you have say the black king in front of the white pawn, and a white queen or rook behind the pawn, and the pawn promotes with a capture, ending up as a new white queen or rook next to the black king. The other is where say the black king is on the seventh rank, white has a rook or queen on the other side of the pawn, and White promotes to a knight, queen or bishop giving check.
answered 10 hours ago
itubitub
5,5271 gold badge13 silver badges33 bronze badges
Thank you for the feedback. The author of perft results is Peter McKenzie, worker of Google. I found him LinkedIn profile and send him a message. Maybe he can answer me.
– Welyab Paula
1 hour ago
add a comment
|
Yes, a double check is when two pieces give check at the same time. It doesn't matter how you got to that position. As to whether there's an error on that wiki, it's probably best to try to ask its author. Maybe they can provide the full list of positions for you to compare.
I can think of two ways of giving double check while promoting. One is where you have say the black king in front of the white pawn, and a white queen or rook behind the pawn, and the pawn promotes with a capture, ending up as a new white queen or rook next to the black king. The other is where say the black king is on the seventh rank, white has a rook or queen on the other side of the pawn, and White promotes to a knight, queen or bishop giving check.
answered 10 hours ago
itubitub
5,5271 gold badge13 silver badges33 bronze badges
Yes, a double check is when two pieces give check at the same time. It doesn't matter how you got to that position. As to whether there's an error on that wiki, it's probably best to try to ask its author. Maybe they can provide the full list of positions for you to compare.
I can think of two ways of giving double check while promoting. One is where you have say the black king in front of the white pawn, and a white queen or rook behind the pawn, and the pawn promotes with a capture, ending up as a new white queen or rook next to the black king. The other is where say the black king is on the seventh rank, white has a rook or queen on the other side of the pawn, and White promotes to a knight, queen or bishop giving check.
answered 10 hours ago
itubitub
5,5271 gold badge13 silver badges33 bronze badges
answered 10 hours ago
itubitub
5,5271 gold badge13 silver badges33 bronze badges
answered 10 hours ago
itubitub
5,5271 gold badge13 silver badges33 bronze badges
answered 10 hours ago
itubitub
5,5271 gold badge13 silver badges33 bronze badges
5,5271 gold badge13 silver badges33 bronze badges
Thank you for the feedback. The author of perft results is Peter McKenzie, worker of Google. I found him LinkedIn profile and send him a message. Maybe he can answer me.
– Welyab Paula
1 hour ago
add a comment
|
Thank you for the feedback. The author of perft results is Peter McKenzie, worker of Google. I found him LinkedIn profile and send him a message. Maybe he can answer me.
– Welyab Paula
1 hour ago
Thank you for the feedback. The author of perft results is Peter McKenzie, worker of Google. I found him LinkedIn profile and send him a message. Maybe he can answer me.
– Welyab Paula
1 hour ago
Thank you for the feedback. The author of perft results is Peter McKenzie, worker of Google. I found him LinkedIn profile and send him a message. Maybe he can answer me.
– Welyab Paula
1 hour ago
add a comment
|
Yes, the case you mentioned would also qualify as a double check.
But it also depends on what your definitions are. If the Perft result does consider that to not be a double check, it doesn't mean you have to abide by it.
answered 1 hour ago
Inertial IgnoranceInertial Ignorance
6,9445 silver badges16 bronze badges
add a comment
|
Yes, the case you mentioned would also qualify as a double check.
But it also depends on what your definitions are. If the Perft result does consider that to not be a double check, it doesn't mean you have to abide by it.
answered 1 hour ago
Inertial IgnoranceInertial Ignorance
6,9445 silver badges16 bronze badges
add a comment
|
Yes, the case you mentioned would also qualify as a double check.
But it also depends on what your definitions are. If the Perft result does consider that to not be a double check, it doesn't mean you have to abide by it.
answered 1 hour ago
Inertial IgnoranceInertial Ignorance
6,9445 silver badges16 bronze badges
Yes, the case you mentioned would also qualify as a double check.
But it also depends on what your definitions are. If the Perft result does consider that to not be a double check, it doesn't mean you have to abide by it.
answered 1 hour ago
Inertial IgnoranceInertial Ignorance
6,9445 silver badges16 bronze badges
answered 1 hour ago
Inertial IgnoranceInertial Ignorance
6,9445 silver badges16 bronze badges
answered 1 hour ago
Inertial IgnoranceInertial Ignorance
6,9445 silver badges16 bronze badges
answered 1 hour ago
Inertial IgnoranceInertial Ignorance
6,9445 silver badges16 bronze badges
6,9445 silver badges16 bronze badges
add a comment
|
add a comment
|
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