MESON Chess Problem Database

Problem Display
PID: 246558 (4Rb1K/3pn1p1/1p2n2p/1R1PkB1Q/4N1P1/3pB1P1/2b3N1/8 w - - 0 1)

Segers, Marcel

The Problemist, 1989

4Rb1K/3pn1p1/1p2n2p/1R1PkB1Q/4N1P1/3pB1P1/2b3N1/8

#2

11 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Sd4
      • 2.Bf4#
    • 1...Sf4
      • 2.gxf4#
    • 1...Sc5
      • 2.Bg6#
    • 1...Sg5
      • 2.d6#
    • 1...Sc7
      • 2.Bg6#
    • 1...Sd8
      • 2.Bg6#
      • 2.d6#
    • 1...Sxd5
      • 2.Bg6#
    • 1...Sxf5
      • 2.Qxf5#
    • 1...Sc6
      • 2.Bg6#
      • 2.d6#
    • 1...Sg6+
      • 2.Bxg6#
    • 1...Sc8
      • 2.Bg6#
      • 2.d6#
    • 1...Sg8
      • 2.Bg6#
      • 2.d6#
  • Tries
    • 1.Sh4?
      • threat
        • 2.Sf3#
      • 1...Sg6+
        • 2.Sxg6#
        • 2.Bxg6#
      • 1...Sxf5
        • 2.Qxf5#
      • 1...Sc5
        • 2.Bg6#
      • 1...Sd4
        • 2.Sg6#
        • 2.Bf4#
      • 1...Sg5
        • 2.Sg6#
        • 2.d6#
      • 1...Bd1!
    • 1.Bg6+?
      • 1...Sf5
        • 2.Qxf5#
      • 1...Sg5!
    • 1.Rxe7?
      • threat
        • 2.Bg6#
        • 2.d6#
      • 1...Bb3
        • 2.Bg6#
      • 1...Ba4
        • 2.Bg6#
      • 1...d6
        • 2.Bg6#
        • 2.Rxe6#
      • 1...g5
        • 2.d6#
      • 1...g6
        • 2.Bxg6#
        • 2.d6#
      • 1...Bxe7!
    • 1.dxe6+?
      • 1...Sd5
        • 2.Bg6#
      • 1...d5!
    • 1.d6+?
      • 1...Sd5
        • 2.Bg6#
      • 1...Sc5!
  • Keys
    • 1.Se1!
      • threat
        • 2.Sf3#
      • 1...Sg6+
        • 2.Bxg6#
      • 1...Sxf5
        • 2.Qxf5#
      • 1...Sc5
        • 2.Bg6#
      • 1...Bd1
        • 2.Sxd3#
      • 1...Sd4
        • 2.Bf4#
      • 1...Sg5
        • 2.d6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 3
  • Sets
    • S(e);N_GUARD,P_SPINS(h),SBLOCK::B(B)
    • S(e);OGATE,P_SPINS(h)::P(C),XS(e)
    • S(e);N_GUARD,P_SPINS(h)::QAR(I)+B(H)
    • S(e);N_GUARD,P_SPINS(h)::R(F)+P(G)
    • S(h);N_GUARD,P_SPINS(h),S_CUTS(e),XP(G)::QAR(I)+B(H)
    • S(h);OGATE,P_SPINS(h),XB(H)::QAR1(I),XS(h)
    • S(h);CHECK,N_GUARD,P_SPINS(e)::QAR(I)+B(H),XS(h)
  • Tries
    • Try
      • S(A);
      • Threat
        • S(A)
      • Vars
        • S(h);OGATE,P_SPINS(h),XB(H)::QAR1(I),XS(h)
        • S(e);N_GUARD,P_SPINS(h)::QAR(I)+B(H)
      • Refutation
        • B(a);
    • Try
      • B(H);CHECK
      • Vars
        • S(h);N_GUARD,P_SPINS(h)::QAR1(I),XS(h)
      • Refutation
        • S(e);P_SPINS(e)
    • Try
      • R(J);P_PINS(e),XS(h)
      • Threat
        • DUALS(2)
      • Vars
        • B(a);::QAR(I)+B(H)
        • P(i);::R(F)+P(G)
      • Refutation
        • B(j);N_SPINS(e),XR(J)
    • Try
      • P(G);CHECK,XS(e)
      • Vars
        • S(h);P_SPINS(h)::QAR(I)+B(H)
      • Refutation
        • P(g);P_SPINP(g)
    • Try
      • P(G);CHECK
      • Vars
        • S(h);P_SPINS(h)::QAR(I)+B(H)
      • Refutation
        • S(e);P_SPINS(e)
  • Actual
    • S(A);
    • Threat
      • S(A)
    • Vars
      • S(h);CHECK,N_GUARD,P_SPINS(e)::QAR(I)+B(H),XS(h)
      • S(h);OGATE,P_SPINS(h),XB(H)::QAR1(I),XS(h)
      • S(e);N_GUARD,P_SPINS(h)::QAR(I)+B(H)
      • B(a);N_GUARD::S(A),XP(b)
      • S(e);N_GUARD,P_SPINS(h),SBLOCK::B(B)
      • S(e);N_GUARD,P_SPINS(h)::R(F)+P(G)
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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).