Tempo Loss Bishop Exchange


In shogi, Tempo Loss Bishop Exchange or One-Turn Loss Bishop Exchange or Bishop Exchange With Tempo Loss is a Bishop Exchange opening that has White trading the bishops very early in the game before Black's bishop moves up to the 77 square.

Overview

Tempo Loss Bishop Exchange was developed by retired player Hitoshige Awaji 9-dan for which he was awarded the prestigious Masuda award in 2006. This opening became popular among professional players around 2004 and was even played in two of the seven matches for the title of Meijin between Toshiyuki Moriuchi and Yoshiharu Habu in 2005.
Before Tempo Loss Bishop Exchange, some professional players had considered that Bishop Exchange openings led White to be pushed into defensive positions and to be unable to launch more powerful attacks, hence reducing the amount of possibilities available to the White player. Since the Tempo Loss variations of Bishop Exchange prevents White from being pushed to the defensive, this new strategy was quite revolutionary.
In the Bishop Exchange opening game, White typically skips pushing their rook pawn to the middle rank and instead trades the bishops off the board early to place them in hand. Before the development of the Tempo Loss variants, no strategy had been developed to follow the tempo loss for White involving the rook file. Specifically, after the tempo loss instead of White advancing the pawn to...P-85, the strategy developed so as to leave the pawn at P-84, so that the knight can jump to the 85 square if necessary. This is the gist of the Tempo Loss strategy. Three variants have been developed involving Reclining Silver, Climbing Silver, and Rushing Silver.

Reclining Silver

This position is almost identical to Bishop Exchange, Reclining Silver, but by keeping the pawn at 8d rather than advancing it to 8e a number of attack possibilities involving the knight on 73 are created. Although compared to the traditional P-85 formation White is not actually gaining a tempo in this case, insofar as the possibility of moving expands, this makes it easier to protect against Black's taking unilateral control of the game.

Climbing Silver

Following the bishop exchange, it is natural for Black to try to take advantage of White's tempo loss with the fast Climbing Silver strategy.