MESON Chess Problem Database

Problem Display
PID: 133237 (r3k2r/5N1P/2P1P2P/2B2K2/3p4/8/4Q3/8 w kq - 0 1)

Rice, John Michael

BCSC Final, 1989-1990

r3k2r/5N1P/2P1P2P/2B2K2/3p4/8/4Q3/8

#2

8 + 4

14538 Palman 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Rg8
      • 2.hxg8Q#
      • 2.hxg8R#
  • Tries
    • 1.Qb5?
      • threat
        • 2.c7#
      • 1...Ra5
        • 2.Qb8#
      • 1...Ra6
        • 2.Qb8#
      • 1...Rb8
        • 2.Qxb8#
      • 1...Rd8!
    • 1.c7?
      • threat
        • 2.Qb5#
      • 1...Ra5
        • 2.c8Q#
        • 2.c8R#
      • 1...Ra6
        • 2.c8Q#
        • 2.c8R#
      • 1...Rb8
        • 2.cxb8Q#
        • 2.cxb8R#
      • 1...Rd8
        • 2.cxd8Q#
        • 2.cxd8R#
      • 1...d3!
  • Keys
    • 1.e7!
      • threat
        • 2.Sd6#
      • 1...Kxf7
        • 2.Qh5#
      • 1...Rd8
        • 2.exd8S#
      • 1...Rf8
        • 2.exf8Q#
        • 2.exf8R#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • R(d);OGATE::PXR(d)=Q
  • Tries
    • Try
      • Q(A);
      • Threat
        • QAB(A)+P(D)
      • Vars
        • R(b);N_GUARD::QAR(A)
        • R(b);N_GUARD::QAR(A),XR(b)
      • Refutation
        • R(b);
    • Try
      • P(D);
      • Threat
        • QAB(A)
      • Vars
        • R(b);N_GUARD,P_PINB(B)::P=Q
        • R(b);N_GUARD::P=Q
        • R(b);OGATE::PXR(b)=Q
      • Refutation
        • P(a);
  • Actual
    • P(E);
    • Threat
      • S(G)
    • Vars
      • K(c);OGATEB,S_FLIGHT,XS(G)::QAB(A)
      • R(b);OGATE::PXR(b)=S
      • R(d);OGATE,P_PINS(G)::PXR(d)=Q
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