Stratego is a strategy board game for two players on a board of 10×10 squares.
 Each player controls 40 pieces representing individual officer ranks in an army.
 The pieces have Napoleonic insignia.
 The objective of the game is to find and capture the opponent's "Flag", or to capture so many enemy pieces that the opponent cannot make any further moves.
 "Stratego" has simple enough rules for young children to play, but a depth of strategy that is also appealing to adults.
 The game is a slightly modified copy of an early 20th century French game named "L'Attaque".
 It has been in production in Europe since World War II and the United States since 1961.
 There are now 2- and 4-handed versions, versions with 10, 30 or 40 pieces per player, and boards with smaller sizes (number of spaces).
 There are also variant pieces and different rulesets.
In the tactics and strategy in the board game of chess, an exchange (exchanging) or trade (trading) of chess pieces is series of closely related moves, typically sequential, in which the two players capture each other's pieces.
 Any types of pieces except the kings may possibly be exchanged, i.e. captured in an exchange, although a king can capture an opponent's piece.
 Either the player of the white or the black pieces may make the first capture of the other player's piece in an exchange, followed by the other player capturing a piece of the first player, often referred to as a "recapture".
 Commonly, the word "exchange" is used when the pieces exchanged are of the same type or of about equal value, which is an "even exchange".
 According to chess tactics, a bishop and a knight are usually of about equal value.
 If the values of the pieces exchanged are not equal, then the player who captures the higher value of piece(s) can be said to be "up the exchange" or "wins the exchange", while the opponent who captures the lower value of piece(s) is "down the exchange" or "loses the exchange".
 Exchanges occur very frequently in chess, in almost every game and usually multiple times per game.
 Exchanges are often related to the tactics or strategy in a chess game, but often simply occur over the course of a game.
Ploy is an abstract strategy board game for two or four players, played on a 9x9 board with a set of 15 pieces (2-handed) or 9 pieces (4-handed and partnership games) per player.
 Pieces have various horizontal, vertical or diagonal moves somewhat like chess pieces, except directions of movement are limited; pieces change directions of movement by "rotating".
 Object of the game is to capture the opponent's "Commander" (analogous to the king in chess), or all of his other pieces.
Caribbean is a 2004 board game designed by Michail Antonow and Jens-Peter Schliemann.
Chapayev (Russian: игра в Чапаева, "igra v Chapayeva" ) was a game played on a checkerboard, a unique hybrid of checkers and billiards which is played throughout the territory of the former USSR.
 The aim is to knock the opponent's pieces off the board.
 The game is named after the Russian Civil War hero, Vasily Chapayev.
 Chapayev was popular among children everywhere in the former USSR.
Sixteen Soldiers is a two-player abstract strategy board game from Sri Lanka.
 It also comes from India under the name Cows and Leopards.
 A variant of this game is also popular in Bangladesh, where it is known as Sholo guti (Sixteen pieces).
 The game is similar to draughts and Alquerque as players hop over one another's pieces to capture them.
 However, unlike draughts and standard Alquerque, the game is played on an expanded Alquerque board consisting of four triangular boards attached to the four sides of an Alquerque board.
 Also, pieces can move and capture in any direction from the beginning.
 There is no promotion to King.
 Its actual closest relatives are Peralikatuma and Kotu Ellima which are also from the Indian subcontinent.
 The only real difference between these three closely related games is the number of pieces.
 In Sixteen Soldiers, each player has 16 pieces hence the name of the game.
 In Peralikatuma, each player has 23 pieces.
 In Kotu Ellima, each player has 24 pieces.
 Sixteen Soldiers is also related to the Indonesian game of Permainan-Tabal.
Kotu Ellima is a two-player abstract strategy board game from Sri Lanka and India.
 The game is similar to draughts and Alquerque as players hop over one another's pieces to capture them.
 However, unlike draughts and standard Alquerque, the game is played on an expanded Alquerque board consisting of four triangular boards attached to the four sides of an Alquerque board.
 Also, pieces can move and capture in any direction from the beginning.
 There is no promotion to King.
 Its actual closest relatives are Peralikatuma and Sixteen Soldiers which are also from the Indian subcontinent.
 The only real difference between these three closely related games is the number of pieces.
 In Sixteen Soldiers, each player has 16 pieces hence the name of the game.
 In Peralikatuma, each player has 23 pieces.
 In Kotu Ellima, each player has 24 pieces.
 The whole board is covered with pieces except the middle point reminiscent of Alquerque.
 Kotu Ellima is also related to the Indonesian game of Permainan-Tabal.
Knocking Piece II is a piece of music by Ben Johnston.
 It is a continuation of Knocking Piece I.
 In both pieces, Johnston calls to demonstrate unconventional methods of playing conventional instruments.
 In Knocking Piece II, percussionists use bouncy balls, brushes on their playing surfaces as they also use a deck of cards for instructions.
Kriegspiel is a chess variant invented by Henry Michael Temple in 1899 and based upon the original Kriegsspiel (German for "war game") developed by Georg von Reiswitz in 1812.
 In this game each player can see their own pieces, but not those of their opponent.
 For this reason, it is necessary to have a third person (or computer) act as a referee, with full information about the progress of the game.
 When it is a player's turn he or she will attempt a move, which the referee will declare to be 'legal' or 'illegal'.
 If the move is illegal, the player tries again; if it is legal, that move stands.
 Each player is given information about checks and captures.
 They may also ask the referee if there are any legal captures with a pawn.
 Since the position of the opponent's pieces is unknown, Kriegspiel is not a game with perfect information.
 Chess Kriegspiel derives from a war game which was used in 19th century Germany to train military officers.
 As each player cannot see his or her opponents pieces, the game is sometimes referred to as "blind chess".
Boxing is a multiplayer sports video game produced by Mattel Electronics and released for its Intellivision video game system in 1981.
 The game simulates a 15-round boxing match with the goal of knocking out the opponent; at the time of the game's release a real-life professional boxing match may have lasted up to 15 rounds.

Question: Between Caribbean and Chapayev what game had a goal of knocking an opponent's pieces off the board?
Answer: Chapayev