MESON Chess Problem Database

Problem Display
PID: 902 (2b1n3/Kp1R3Q/1pk1Np2/5P2/6p1/6B1/5p2/5B2 w - - 0 1)

Coward, John R

The Problemist Supplement, 1992

2b1n3/Kp1R3Q/1pk1Np2/5P2/6p1/6B1/5p2/5B2

#2

7 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Bxd7
      • 2.Qh1#
    • 1...Sd6
      • 2.Rxd6#
    • 1...Sc7
      • 2.Rd6#
    • 1...Sg7
      • 2.Rd6#
    • 1...b5
      • 2.Bg2#
  • Tries
    • 1.Kb8?
      • 1...Bxd7
        • 2.Qh1#
      • 1...Sd6
        • 2.Rxd6#
      • 1...Sg7
        • 2.Rd6#
      • 1...Sc7
        • 2.Rd6#
      • 1...b5!
    • 1.Bf4?
      • 1...Bxd7
        • 2.Qh1#
      • 1...Sd6
        • 2.Rxd6#
      • 1...Sg7
        • 2.Rd6#
      • 1...Sc7
        • 2.Rd6#
      • 1...b5
        • 2.Bg2#
      • 1...g3!
    • 1.Rd1?
      • threat
        • 2.Qh1#
      • 1...Sd6
        • 2.Rxd6#
        • 2.Qc7#
      • 1...Sc7
        • 2.Rd6#
        • 2.Qxc7#
      • 1...Bxe6!
    • 1.Rd2?
      • threat
        • 2.Qh1#
      • 1...Sd6
        • 2.Rxd6#
        • 2.Qc7#
      • 1...Sc7
        • 2.Rd6#
        • 2.Qxc7#
      • 1...Bxe6!
    • 1.Rd4?
      • threat
        • 2.Qh1#
      • 1...Sd6
        • 2.Rxd6#
        • 2.Qc7#
      • 1...Sc7
        • 2.Rd6#
        • 2.Qxc7#
      • 1...Bxe6!
    • 1.Rc7+?
      • 1...Kd5
        • 2.Bg2#
        • 2.Qh1#
      • 1...Sxc7!
    • 1.Rd8?
      • threat
        • 2.Qh1#
      • 1...Sd6
        • 2.Rxd6#
      • 1...Sc7
        • 2.Rd6#
        • 2.Qxc7#
      • 1...Bxe6!
    • 1.Qe7?
      • threat
        • 2.Sd4#
        • 2.Sd8#
      • 1...Sd6
        • 2.Rxd6#
        • 2.Qxd6#
      • 1...Bxd7!
    • 1.Qf7?
      • 1...Sd6
        • 2.Rxd6#
      • 1...Sc7
        • 2.Rd6#
      • 1...Sg7
        • 2.Rd6#
      • 1...b5
        • 2.Bg2#
      • 1...Bxd7!
    • 1.Qg7?
      • 1...Sxg7
        • 2.Rd6#
      • 1...Sd6
        • 2.Rxd6#
      • 1...Sc7
        • 2.Rd6#
      • 1...b5
        • 2.Bg2#
      • 1...Bxd7!
  • Keys
    • 1.Rd5!
      • 1...Kxd5
        • 2.Qh1#
      • 1...Bxe6
        • 2.Qxb7#
      • 1...Bd7
        • 2.Qxd7#
      • 1...Sd6
        • 2.Rxd6#
      • 1...Sc7
        • 2.Rd6#
      • 1...Sg7
        • 2.Rd6#
      • 1...b5
        • 2.Rc5#

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • B(g);SBLOCK,XR(F)::QAB(G)
    • S(h);N_GUARD::R1(F),XS(h)
    • S(h);N_GUARD::R1(F)
    • P(c);SBLOCK::B(A)
  • Tries
    • Try
      • K(E);S_FLIGHT
      • Vars
        • B(g);SBLOCK,XR(F)::QAB(G)
        • S(h);N_GUARD::R1(F),XS(h)
        • S(h);N_GUARD::R1(F)
      • Refutation
        • P(c);
    • Try
      • B(B);
      • Vars
        • B(g);SBLOCK,XR(F)::QAB(G)
        • S(h);N_GUARD::R1(F),XS(h)
        • S(h);N_GUARD::R1(F)
        • P(c);SBLOCK::B(A)
      • Refutation
        • P(b);
    • Try
      • R(F);
      • Threat
        • QAB(G)
      • Refutation
        • B(g);XS(D)
    • Try
      • R(F);
      • Threat
        • QAB(G)
      • Refutation
        • B(g);XS(D)
    • Try
      • R(F);
      • Threat
        • QAB(G)
      • Refutation
        • B(g);XS(D)
    • Try
      • R(F);CHECK
      • Refutation
        • S(h);XR(F)
    • Try
      • R(F);
      • Threat
        • QAB(G)
      • Vars
        • S(h);N_GUARD::R1(F),XS(h)
      • Refutation
        • B(g);XS(D)
    • Try
      • Q(G);
      • Threat
        • DUALS(2)
      • Refutation
        • B(g);XR(F)
    • Try
      • Q(G);
      • Vars
        • S(h);N_GUARD::R1(F),XS(h)
        • S(h);N_GUARD::R1(F)
        • P(c);SBLOCK::B(A)
      • Refutation
        • B(g);XR(F)
    • Try
      • Q(G);
      • Vars
        • S(h);N_GUARD,XQ(G)::R1(F)
        • S(h);N_GUARD::R1(F),XS(h)
        • S(h);N_GUARD::R1(F)
        • P(c);SBLOCK::B(A)
      • Refutation
        • B(g);XR(F)
  • Actual
    • R(F);
    • Vars
      • K(d);OGATEB,S_FLIGHT,XR(F)::QAB(G)
      • B(g);N_GUARD,XS(D)::QAB1(G),XP(f)
      • B(g);N_GUARD::QAB1(G),XB(g)
      • S(h);N_GUARD::R1(F),XS(h)
      • S(h);N_GUARD::R1(F)
      • P(c);N_GUARD::R1(F)
HTML5 logo

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).