Good Evening Puzzlers, This problem is from Mario Lang's puzzle web page at http://delysid.org/chess/epd.cgi and is reported to be from Fred Reinfield's book "Win At Chess" 1958. This problem is a lot of work for little gain. I finally looked up the answer and even after knowing the correct next move, I'm not sure of either the point or the principle. Just a warning. Problem WAC019 White to move FEN Problem Setup: r1b2rk1/ ppbn1ppp/ 4p3/ 1QP4q/ 3P4/ N4N2/ 5PPP/ R1B2RK1 w - - 0 1 Short Algebraic Problem Setup: White: Kg1, Qb5, Ra1, Rf1, Bc1, Na3, Nf3, Pc5, Pd4, Pf2, Pg2, Ph2 Black: Kg8, Qh5, Ra8, Rf8, Bc7, Bc8, Nd7, Pa7, Pb7, Pe6, Pf7, Pg7, Ph7