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
Horse head mask Horse head mask The horse head mask is a latex mask representing a horse head originally manufactured by novelty purveyor Archie McPhee, and now widely available from other manufacturers. The mask covers the entire head and is typically part of a Halloween costume, or at other times to be funny, shocking, incongruous, or hip, or to disguise one's identity. It has also become an internet meme. The horse mask was originally sold by novelty purveyor Archie McPhee as a Halloween costume since at least 2003. It is marketed under the name "Horse Head Mask" and is made of "realistic brown