Chess - block of stamps mint never hinged, Central Africa

This block of stamps on the subject of "chess" was published in Central Africa on June 25, 2012 and contains a stamp. The stamp for 3,000 F shows the chess player Wilhelm Steinitz. Wilhelm Steinitz was an important Austrian-American chess player from Bohemia and the first officially recognized world chess champion (1886-1894). The edge of the block is illustrated with various chess figures.
Chess is a board game for two people. One player plays with the white pieces, the other player with the black pieces. At the beginning of the game, both players have 16 pieces: a king, a queen, two bishops, two knights, two rooks and eight pawns. The aim of the game of chess is to checkmate the opponent.