Which Promotion Is Legal?
White is in check: choose a candidate move.
Yes, but only if the promotion move gets your king out of check. The pawn may capture the checking piece or promote on a square that blocks a rook, bishop, or queen line. A promotion that leaves even one check active is illegal, even when it gives check to the opponent.
1. Identify every checker. Double check changes the answer.
2. Make a legal pawn move. Advance to an empty final-rank square or capture diagonally onto it.
3. Recheck your king. After promotion, no enemy piece may still attack it.
The black rook on a8 checks the white king on a1. Compare a promotion that removes the rook with one that ignores it.
Which Promotion Is Legal?
White is in check: choose a candidate move.
The black rook on h8 checks the white king on a8. The pawn can promote on b8 and close the line immediately.
Does the Promotion Piece Matter?
White is in check: choose a blocking piece.
Decide whether each proposed promotion is legal, reveal the answer, then run the move to inspect the final king safety.
1. Capture the Checking Rook
White is checked on the a-file. Is bxa8=Q+ legal?
2. Ignore the Checking Rook
From the same check, is b8=Q legal?
3. Block with a Queen Promotion
The rook checks along rank eight. Is b8=Q legal?
4. Block with a Knight Promotion
In the same rook check, is b8=N legal?
5. Capture a Checking Knight
The knight on h8 checks the king on f7. Is gxh8=Q+ legal?
6. Knight Check Cannot Be Blocked
From the same knight check, is g8=Q legal?
7. A Checking Promotion Is Still Illegal
The rook on h1 checks White. Is a8=Q+ legal?
8. Capturing One of Two Checkers
Rook and bishop both check White. Is bxa8=Q legal?
Promotion is part of the pawn move, not a later bonus action. The pawn reaches the final rank and is replaced immediately by the chosen queen, rook, bishop, or knight. Legality is judged from that resulting position, so the move works when the pawn captures the checker or the new piece occupies a square that blocks a rook, bishop, or queen line.
The same final-position test rejects a promotion that merely gives counter-check. You must remove every attack on your own king before any threat against the opposing king matters.
Knight or Pawn Check
These checks cannot be blocked. Promotion must capture the checker or otherwise remove its attack.
Double Check
Capturing or blocking only one checking line is insufficient. The final position must remove both checks.
Pinned Pawn
A pawn may not promote if moving it exposes a rook, bishop, or queen attack on its own king.
Over the board: move the pawn to its final square and replace it with the chosen piece as one move. If the promotion does not remove every check, the attempted move is illegal and tournament correction procedures apply.
Online: select the promotion piece in the interface. Legal-move software should reject any choice that leaves your king attacked, even if the promoted piece would check the opposing king.
Yes, but only when the promotion move also removes the check against your king. A legal promotion may capture the checking piece, block a sliding check, or otherwise leave the king safe. Test bxa8=Q+ in the Capture the Checker laboratory.
Yes, promotion can be a legal check response when the resulting move makes your king safe. The promoted piece begins occupying and controlling its new square immediately. Compare the capture-promotion and blocking-promotion laboratories.
No, giving check to the opposing king does not excuse leaving your own king in check. Your move is illegal unless it first resolves every attack on your king. Try a8=Q+ in the Ignore a Rook Check trainer position.
Yes, a pawn may capture diagonally onto its final rank, remove the checker, and promote as one move. The move is legal if the king is safe in the resulting position. Play bxa8=Q+ in the first laboratory.
Yes, a pawn can advance to its final rank, promote, and place the new piece between a sliding checker and its king. The block works because the promoted piece occupies the destination square immediately. Play b8=Q in the Block the Rook laboratory.
Yes, provided the promotion square lies between the rook and the checked king. Any legal promotion piece occupies that square and can make the block. Compare b8=Q and b8=N in the blocking examples.
Yes, when the promotion square lies on the checking bishop's diagonal between the bishop and king. The chosen queen, rook, bishop, or knight can serve as the blocking piece because occupation of the square is what matters. Apply the same safety test used in the Block the Rook laboratory.
Yes, a promotion can block a queen's rook-like or bishop-like line of attack. It cannot block a queen checking from an adjacent square where there is no intervening square. Use the three-question legality test before choosing the promotion.
A knight check cannot be blocked, so promotion works only if the pawn captures the checking knight or the move removes the king from the knight's attack in another legal way. In the trainer, gxh8=Q+ captures the checking knight while g8=Q does not. Compare those two cards directly.
A pawn check cannot be blocked because the pawn attacks an adjacent diagonal square. A promotion response must capture the checking pawn or otherwise leave the king outside its attack. Judge the final position, not the fact that a promotion occurred.
Normally no, because double check usually requires the king to move. Capturing or blocking only one checker is insufficient if the other attack remains. Run the Double Check Remains example to see why bxa8=Q is illegal there.
Every legal chess move must leave the moving side's king unattacked. Promotion changes the pawn into a piece but does not suspend the check rule. Use the trainer's attack arrows to identify the line that remains open.
Yes, the promoted queen, rook, bishop, or knight is present immediately and its occupation or attacks count in the resulting position. That immediate effect can block a line or capture a checker. Play b8=N in the blocking position to see even a knight serve as a physical shield.
For a simple interposition, every promotion choice occupies the same square and may block the line. The best choice can still differ because the resulting attacks, material, stalemate risks, or tactics differ. Compare queen and knight promotion in the Legal Blocking Choice cards.
No, you may promote to a queen, rook, bishop, or knight when that promotion move legally resolves the check. Sometimes an underpromotion is tactically superior even though several choices are legal. Continue to the Underpromotion Trainer after completing this legality trainer.
Yes, underpromotion is legal while in check if the move leaves your king safe. A rook, bishop, or knight is not disqualified merely because a queen would also work. Test b8=N in the Block the Rook example.
Yes, one promotion move can remove the attack on your king and give check to the opponent. Capturing the checking rook with bxa8=Q+ is a clear example. Play that move in the first laboratory and inspect both kings.
Yes, if the legal promotion both resolves your check and leaves the opponent with no legal reply. The move must still satisfy your king's safety before its mating effect matters. Analyse the final position exactly as you would after any checking promotion.
Yes, but only when that pawn move resolves the check, usually by blocking a line. A forward promotion can therefore be legal when its destination lies between a rook, bishop, or queen and the king. Play b8=Q in the blocking laboratory.
No, pawns never move sideways. They move straight forward without capturing or diagonally forward when capturing, including on the promotion move. Choose only a geometrically legal pawn move before testing whether it resolves check.
No, a pawn cannot capture a piece directly ahead, even on the final rank. It may advance to an empty promotion square or capture diagonally onto the final rank. The capture-promotion laboratory uses the legal diagonal move bxa8=Q+.
A pawn cannot advance straight onto an occupied square. It may promote by capturing an enemy piece diagonally, but it cannot capture a friendly piece or move onto its own king's square. Check both pawn movement and king safety before calling the response legal.
Then the promotion is illegal because the king remains attacked in the resulting position. Removing one checker is not enough when a second line or piece still checks. The Double Check Remains trainer card demonstrates this exact trap.
Only if moving that pawn does not expose its king and the promotion also resolves the current check. A pin can make an otherwise normal promotion illegal. Trace every attack on the king after the pawn leaves its starting square.
Standard algebraic notation records the pawn's file, capture, destination, promoted piece, and check sign, as in bxa8=Q+. The plus sign describes the opponent's resulting check, not permission to ignore your own. Read the notation beside the first laboratory result.
A non-capturing promotion is written with the destination and chosen piece, such as b8=Q or b8=N. No plus sign is added unless the move also checks the opponent. Compare the notation on the two legal blocking trainer cards.
Yes, the board should reject it when the proposed promotion does not remove the check or the pawn move itself is illegal. It should allow a capture-promotion or blocking promotion that leaves the king safe. Recreate the rejected idea in the trainer to identify the remaining attack.
First identify every checking piece, then ask whether the pawn can legally capture a checker or block every checking line. Finally verify that the king is unattacked after the pawn becomes the chosen piece. Use the three-step legality test at the top of this page.
The legal-move rule is the same in correspondence, online, rapid, blitz, and over-the-board chess. Interface procedures may differ, but the final position must leave your king safe. Use the board examples here as the rules test regardless of time control.
Next study general pawn-promotion rules, underpromotion, immediate promotion checks, pins, and ways to answer check. Those topics explain both the move mechanics and the tactical exceptions. Follow the related-rule routes below after finishing all eight trainer positions.
Build sharper tactical judgment for checks, captures, and promotion races.
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