Detective Chess

Background

Martin Gardner attributes this puzzle to Jaime Poniachik.

An unsolved puzzle consists of a portion of a chessboard. Some squares contain numbers while others are marked for locating pieces.

The goal is to place chess pieces (usually one of each non-pawn piece) into the marked squares to satisfy the clues.

The solved grid must satisfy the following conditions:

Using standard attack rules, each numbered clue indicates how many chess pieces are threatening it.

Detektivschach