r5nr/1p1bk1q1/n1pp1ppp/pP1Pp3/P1P2b2/N6P/R3PPP1/1Q2KBNR b - - 4 21
FEN state: r5nr/1p1bk1q1/n1pp1ppp/pP1Pp3/P1P2b2/N6P/R3PPP1/1Q2KBNR b - - 4 21 ; Best move: a6b4
The current state of the chess board is: Black rook at a8, black knight at g8 and black rook at h8. Black pawn at b7, black bishop at d7, black king at e7 and black queen at g7. Black knight at a6, black pawn at c6, black pawn at d6, black pawn at f6, black pawn at g6 and black pawn at h6. Black pawn at a5, white pawn at b5, white pawn at d5 and black pawn at e5. White pawn at a4, white pawn at c4 and black bishop at f4. White knight at a3 and white pawn at h3. White rook at a2, white pawn at e2, white pawn at f2 and white pawn at g2. White queen at b1, white king at e1, white bishop at f1, white knight at g1 and white rook at h1. Both players have exhausted their castles. Half move number is 4. Full move number is 21. Black to move.