Undermining (chess) Undermining (chess) Undermining (also known as removal of the guard, or removing the defender) is a chess tactic in which a defensive piece is captured, leaving one of the opponent's pieces undefended or under-defended. The opponent has the unpalatable choice of recapturing or saving the undefended piece. A possible response is to sacrifice the piece whose defense was undermined before capturing the piece which just took the defender. Kramnik–Topalov in the seventh round of the 2004 Linares chess tournament reached the diagrammed position with White to play. The black knight on a4 is defended only by the black pawn on
Rhombic Chess Rhombic Chess Rhombic Chess is a chess variant for two players created by Tony Paletta in 1980. The gameboard has an overall hexagonal shape and comprises 72 rhombi in three alternating colors. Each player commands a full set of standard chess pieces. The game was first published in "Chess Spectrum Newsletter" 2 by the inventor. It was included in "World Game Review" No. 10 edited by Michael Keller. The diagram shows the starting setup. As in standard chess, White moves first and checkmate wins the game. Piece moves are described using two basic types of movement: Circa 2000, Paletta created