MESON Chess Problem Database

Problem Display
PID: 100877 (8/1nNPrNp1/5kB1/7P/1Q1q3P/1n1p2K1/1B3P2/5R2 w - - 0 1)

Coombs, Leslie D

Good Companions, 1918

8/1nNPrNp1/5kB1/7P/1Q1q3P/1n1p2K1/1B3P2/5R2

#2

11 + 7

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qxb2
      • 2.Qf4#
    • 1...Qc3
      • 2.Qf4#
    • 1...Qe5+
      • 2.Qf4#
    • 1...Re3+
      • 2.fxe3#
    • 1...Re6
      • 2.Sd5#
    • 1...Re8
      • 2.dxe8S#
  • Tries
    • 1.Bxd4+?
      • 1...Re5
        • 2.Bxe5#
      • 1...Sxd4!
    • 1.Qd6+?
      • 1...Re6
        • 2.Sd5#
        • 2.Se8#
        • 2.Qxe6#
      • 1...Sxd6!
    • 1.Qxd4+?
      • 1...Re5
        • 2.Qxe5#
      • 1...Sxd4!
    • 1.Qb6+?
      • 1...Re6
        • 2.Sd5#
        • 2.Qxe6#
      • 1...Sd6!
  • Keys
    • 1.Se5!
      • threat
        • 2.Sg4#
      • 1...Qxf2+
        • 2.Rxf2#
      • 1...Qe3+
        • 2.fxe3#
      • 1...Qxe5+
        • 2.Qf4#
      • 1...Qf4+
        • 2.Qxf4#
      • 1...Qg4+
        • 2.Sxg4#
      • 1...Qxh4+
        • 2.Qxh4#
      • 1...Kxe5
        • 2.Qxe7#
      • 1...Rxe5
        • 2.Qf8#
      • 1...Qd6
        • 2.Qf4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 8
    • REMOVED MATES = 5
  • Sets
    • Q(c);N_SPINQ(c),OGATE,XB(B)::QAR2(E)
    • Q(c);OGATE::QAR2(E)
    • Q(c);CHECK,OGATE::QAR2(E)
    • R(f);CHECK,OGATE::R(A)+P(C),XR(f)
    • R(f);SBLOCK::S(I)
    • R(f);OGATE::PXR(f)=S
  • Tries
    • Try
      • B(B);CHECK,XQ(c)
      • Vars
        • R(f);N_GUARD,P_SPINR(f)::B(B),XR(f)
      • Refutation
        • S(a);XB(B)
    • Try
      • Q(E);CHECK
      • Refutation
        • S(e);XQ(E)
    • Try
      • Q(E);CHECK,XQ(c)
      • Vars
        • R(f);N_GUARD,P_SPINR(f)::QAB1(E),XR(f)
      • Refutation
        • S(a);P_SPINS(a),XQ(E)
    • Try
      • Q(E);CHECK
      • Refutation
        • S(e);P_SPINS(e)
  • Actual
    • S(K);N_PINQ(c)
    • Threat
      • S(K)
    • Vars
      • Q(c);CHECK,OGATE,P_SPINQ(c),XP(C)::R(A),XQ(c)
      • Q(c);CHECK,OGATE::R(A)+P(C),XQ(c)
      • Q(c);CHECK,OGATE,P_SPINQ(c),XS(K)::QAR2(E)
      • Q(c);CHECK,OGATE::QAR2(E),XQ(c)
      • Q(c);CHECK::B(B)+S(K),DCHECK,XQ(c)
      • Q(c);CHECK,OGATE,XP(F)::QAB(E),XQ(c)
      • K(d);P_SPINQ(c),S_FLIGHT,XS(K)::QAR2(E),XR(f)
      • R(f);OGATE,SBLOCK,XS(K)::QAR2(E)
      • Q(c);OGATE,P_PINS(K)::QAR2(E)
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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).