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# What is the “stipulation” in a chess puzzle?

The stipulation is a statement that dictates what the puzzle player is to accomplish. A common example is “white to play and win in three moves.”

# What's the name for a chess puzzle with the task “white to play and win in two moves?”

A directmate asks the player to win in a certain number of moves.

# Which type of chess puzzle does not require completion in a certain number of moves?

A study asks white to win (or draw), but it doesn't require the player to do so in a certain number of moves.

# Which kind of chess puzzle asks white to force black to deliver a checkmate, while black resists?

A selfmate is a puzzle where white tries to force black into delivering a checkmate. Helpmates are slightly different, because black cooperates to deliver the checkmate.

# What's the name for a chess puzzle that requires a player to reconstruct the moves that led up to the given scenario?

A retrograde analysis puzzle asks a question (such as “whose turn is it to move?”) that requires the player to figure out the previous set of moves.

# In a chess problem, what is known as “the key?”

The key is the correct first move in a problem. Keys are often unexpected moves that don’t result in a check or an attack.

# In what kind of chess puzzle might you find a nightrider?

A nightrider is a popular unorthodox piece used in fairy chess, a genre of chess puzzles that incorporates unusual rules and pieces.

# What's the name for an incorrect first move in a chess problem?

A “try” is a first move that looks like it will solve the problem, but is actually incorrect.

# A chess problem with more than one solution is said to be what?

A problem is considered to be “cooked” when it has more than one solution (or more solutions than the composer intended).

# What rule applies in a maximummer chess puzzle?

A maximummer requires black to make the geometrically longest move possible. These are used most often in selfmates. Though they're less common, a double maximummer requires both sides to make the longest moves possible.

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Image: refer to hsw