Đỏ tiên, mời các bạn cùng giải.
http://nt4.upanh.com/b3.s33.d2/5ed08...64684.vui2.png
FEN: 4n4/3C1k3/2N3P2/3n1r3/4P4/4R4/3C1r3/2R3p2/3p1p3/4K4 w
http://nt1.upanh.com/b6.s32.d1/d56f0...64791.vui3.png
FEN: 9/4c4/3aka3/3P1P3/3P1P3/9/9/9/2pR1pc2/3K1n3 w
http://nt7.upanh.com/b1.s35.d4/6511e...65267.vui4.png
FEN: 9/4ak3/6P2/9/9/6P2/3p1pp2/4p4/5K3/5R3 w