Battery: Placement of two different pieces of the same color on the same file, rank, or diagonal. The move of the piece that stands closer to the opponent's king (or other piece) allows the second piece to join the action. Batteries are classified by the closer pieces: there can be king, rook, bishop, knight, or pawn batteries. M. Miljanic 2015 [diagram] White to move and win 1.c6+ Ka8! After 1.Kxa6 2.cxd7+, the pawn and rook battery gets to work.

2.Nc7+! We give up our own knight instead of capturing the enemy one: 2.Qxd7? Re2+! 3.Kf3 Qf8+ 4.Kxe2 Qf3+! 5.Kxf3, stalemate. 2.cxd7? Qc4+, etc.

even loses. 2.Qxc7 3.Rg8+ Rf8! Going for a different stalemate counterplay. The pin does not protect from the knight check: 3.Nf8 4.Qxc7. Another pin decides matters after 3.

Ka7 4.Qxd7 Rf4+ 5.Ke3 Rf7 6.Qd4+!. 4.Rxf8+ Nb8 5.Qh6! (5.Qxc7?, stalemate.

) 5.Qh7+! After 5.Qe7+ 6.Kd5 Qb4 7.Qc1! Black will not be able to resist for long. 6.Rf5! A beautiful, if forced, queen sacrifice. 6.

Qxh6 7.Ra5+ Na6 8.Rxa6+ Kb8 The rook stands on the other side of the pawn, again forming a battery. This time, the blow is fatal. [diagram] 9.c7+ Kxc7 10.Rxh6 1-0 Battery transformation: The pieces in the initial battery switch places during the play. An.

Kuznetsov, B. Sakharov 1957 [diagram] White to move and win The rook and bishop battery shoots immediately. 1.Rd6+! The c5-pawn is more important than the h3-bishop: 1.Rh5+? Kc7 2.Rxh3 bxc5 with equality. 1.Kb5! Refusing the bait.

After 1.Kxc5, the fifth rank is opened up, and the initial battery strikes again. 2.Rd5+ Kc6 3.Ra5+!, winning the rook. 1.Kc7 2.cxb6+ Kxd6 3.

bxa7 is even worse. 2.cxb6 Be6+! 2.Ra1 3.b7 is curtains. 3.Rxe6! The black rook is under attack, so White can sacrifice his own rook without a second thought. Not 3.

Kb2? Ra2+ 4.Kb1 Rh2 5.b7 Rh8=, and 3.Kc3? is even worse due to 3.Ra3+. 3.Rb7! Black matches White blow for blow. Not 4.

Bxb7? dxe6 and the pawn is lost. 4.Re5+! d5! In the critical position, Black is helped by the problem-like Novotny interference.