MESON Chess Problem Database

Problem Display
PID: 16325 (3R2BB/7P/2pnq3/R1nk4/2rp4/1Qp2K2/4P3/8 w - - 0 1)

Davis, Edward

Chess, 1940

3R2BB/7P/2pnq3/R1nk4/2rp4/1Qp2K2/4P3/8

#2

8 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Qf7+
      • 2.Bxf7#
    • 1...Qxg8
      • 2.hxg8Q#
      • 2.hxg8B#
    • 1...d3
      • 2.e4#
  • Tries
    • 1.Bf6?
      • 1...Qxg8
        • 2.hxg8Q#
        • 2.hxg8B#
      • 1...Qf7
        • 2.Bxf7#
      • 1...d3
        • 2.e4#
      • 1...c2!
    • 1.Bg7?
      • 1...Qf7+
        • 2.Bxf7#
      • 1...Qxg8
        • 2.hxg8Q#
        • 2.hxg8B#
      • 1...d3
        • 2.e4#
      • 1...c2!
    • 1.Rd7?
      • 1...Qf7+
        • 2.Bxf7#
      • 1...Qxg8
        • 2.hxg8Q#
        • 2.hxg8B#
      • 1...d3
        • 2.e4#
      • 1...c2!
    • 1.Qa2?
      • 1...Qf7+
        • 2.Bxf7#
      • 1...Qxg8
        • 2.hxg8Q#
        • 2.hxg8B#
      • 1...d3
        • 2.e4#
      • 1...c2!
    • 1.e3?
      • threat
        • 2.e4#
      • 1...Qf7+
        • 2.Bxf7#
      • 1...Qxg8
        • 2.hxg8Q#
        • 2.hxg8B#
      • 1...dxe3!
  • Keys
    • 1.Kf4!
      • 1...Qf7+
        • 2.Bxf7#
      • 1...d3+
        • 2.e4#
      • 1...Qxg8
        • 2.hxg8Q#
        • 2.hxg8B#
      • 1...c2
        • 2.Qf3#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • Q(h);CHECK,OGATEB::B(G),XQ(h)
    • Q(h);N_SPINQ(h),OGATE,XB(G)::PXQ(h)=Q
    • P(c);N_GUARD::P(A)
  • Tries
    • Try
      • B(H);
      • Vars
        • Q(h);N_SPINQ(h),OGATE,XB(G)::PXQ(h)=Q
        • Q(h);OGATEB,P_PINB(H)::B(G),XQ(h)
        • P(c);N_GUARD::P(A)
      • Refutation
        • P(a);
    • Try
      • B(H);
      • Vars
        • Q(h);CHECK,OGATEB::B(G),XQ(h)
        • Q(h);N_SPINQ(h),OGATE,XB(G)::PXQ(h)=Q
        • P(c);N_GUARD::P(A)
      • Refutation
        • P(a);
    • Try
      • R(F);
      • Vars
        • Q(h);CHECK,OGATEB::B(G),XQ(h)
        • Q(h);N_SPINQ(h),OGATE,XB(G)::PXQ(h)=Q
        • P(c);N_GUARD::P(A)
      • Refutation
        • P(a);
    • Try
      • Q(B);
      • Vars
        • Q(h);CHECK,OGATEB::B(G),XQ(h)
        • Q(h);N_SPINQ(h),OGATE,XB(G)::PXQ(h)=Q
        • P(c);N_GUARD::P(A)
      • Refutation
        • P(a);
    • Try
      • P(A);
      • Threat
        • P(A)
      • Vars
        • Q(h);CHECK,OGATEB::B(G),XQ(h)
        • Q(h);N_SPINQ(h),OGATE,XB(G)::PXQ(h)=Q
      • Refutation
        • P(c);XP(A)
  • Actual
    • K(C);P-FLIGHT
    • Vars
      • Q(h);CHECK,OGATEB::B(G),XQ(h)
      • P(c);CHECK,N_GUARD::P(A)
      • Q(h);N_SPINQ(h),OGATE,XB(G)::PXQ(h)=Q
      • P(a);OGATE::QAB(B)
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Developed and maintained by Brian Stephenson.
Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).