r1bqkbr1/2pp4/5p2/1p4p1/pnPPP3/P4PPP/1P1B2B1/RN3KNR w - - 2 20
FEN state: r1bqkbr1/2pp4/5p2/1p4p1/pnPPP3/P4PPP/1P1B2B1/RN3KNR w - - 2 20 ; Best move: a3b4
The current state of the chess board is: Black rook at a8, black bishop at c8, black queen at d8, black king at e8, black bishop at f8 and black rook at g8. Black pawn at c7 and black pawn at d7. Black pawn at f6. Black pawn at b5 and black pawn at g5. Black pawn at a4, black knight at b4, white pawn at c4, white pawn at d4 and white pawn at e4. White pawn at a3, white pawn at f3, white pawn at g3 and white pawn at h3. White pawn at b2, white bishop at d2 and white bishop at g2. White rook at a1, white knight at b1, white king at f1, white knight at g1 and white rook at h1. Both players have exhausted their castles. Half move number is 2. Full move number is 20. White to move.