MESON Chess Problem Database

Problem Display
PID: 1179 (4R3/4n2B/q1Qp4/p2r1p2/3N2N1/1Ppk2P1/8/3K2B1 w - - 0 1)

Shire, David J

Problem Observer, 1996

4R3/4n2B/q1Qp4/p2r1p2/3N2N1/1Ppk2P1/8/3K2B1

#2

9 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Ke4
      • 2.Bxf5#
    • 1...Rxd4
      • 2.Qf3#
    • 1...Rb5
      • 2.Qf3#
    • 1...Rc5
      • 2.Qf3#
    • 1...c2+
      • 2.Qxc2#
  • Tries
    • 1.Sc2?
      • threat
        • 2.Sf2#
      • 1...Qb6
        • 2.Qc4#
      • 1...Qa7
        • 2.Qc4#
      • 1...Ke4+!
    • 1.Qxc3+?
      • 1...Ke4
        • 2.Qe3#
        • 2.Qf3#
      • 1...Kxc3!
    • 1.Qxa6+?
      • 1...Ke4
        • 2.Qe2#
      • 1...Rb5!
  • Keys
    • 1.Sxf5!
      • threat
        • 2.Sf2#
      • 1...Ke4+
        • 2.Sd4#
      • 1...c2+
        • 2.Qxc2#
      • 1...Rxf5
        • 2.Qf3#
      • 1...Sxf5
        • 2.Qxd5#
      • 1...Qb6
        • 2.Qc4#
      • 1...Qa7
        • 2.Qc4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 3
  • Sets
    • K(b);P_PINS(E),P_SPINR(d),P_SPINS(h),S_FLIGHT::B(H),XP(e)
    • R(d);OGATE,XS(E)::QAR2(G)
    • R(d);OGATE::QAR2(G)
    • P(a);CHECK,OGATE::QAB1(G),XP(a)
  • Tries
    • Try
      • S(E);
      • Threat
        • S(F)
      • Vars
        • Q(f);N_GUARD::QAB1(G)
      • Refutation
        • K(b);CHECK,P_SPINR(d),P_SPINS(h),S_FLIGHT
    • Try
      • Q(G);CHECK,XP(a)
      • Refutation
        • K(b);N_SPINP(e),P-FLIGHT,P_PINS(E),XQ(G)
    • Try
      • Q(G);CHECK,XQ(f)
      • Vars
        • K(b);OGATE,P_PINS(E),P_SPINS(h),S_FLIGHT::QAR2(G)
      • Refutation
        • R(d);P_SPINR(d)
  • Actual
    • S(E);XP(e)
    • Threat
      • S(F)
    • Vars
      • K(b);CHECK,P_SPINR(d),P_SPINS(h),S_FLIGHT::B(H)+S(E)
      • P(a);CHECK,OGATE::QAB1(G),XP(a)
      • R(d);OGATE,P_SPINR(d),XS(E)::QAR2(G)
      • S(h);N_GUARD,P_SPINS(h),XS(E)::QAR2(G),XR(d)
      • Q(f);N_GUARD::QAB1(G)
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