MESON Chess Problem Database

Problem Display
PID: 173161 (4R3/4p3/B1pQ1P2/1r1N2K1/7N/4B3/6R1/5k2 w - - 0 1)

Ling, John Francis

Problem Observer, 2005

4R3/4p3/B1pQ1P2/1r1N2K1/7N/4B3/6R1/5k2

#2

9 + 4

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Tries
    • 1.Bxb5+?
      • 1...Ke1
        • 2.Rg1#
      • 1...cxb5!
    • 1.Rf2+?
      • 1...Kg1
        • 2.Qh2#
      • 1...Ke1!
    • 1.Qh2?
      • threat
        • 2.Rg1#
        • 2.Qg1#
        • 2.Qh1#
      • 1...Ke1
        • 2.Rg1#
        • 2.Qg1#
        • 2.Qh1#
      • 1...exf6+!
    • 1.Qa3?
      • threat
        • 2.Qc1#
        • 2.Qa1#
      • 1...Ke1
        • 2.Qc1#
      • 1...exf6+!
    • 1.Qc5?
      • threat
        • 2.Qc1#
      • 1...Ke1
        • 2.Qc1#
      • 1...exf6+!
    • 1.Qxc6?
      • threat
        • 2.Qc1#
      • 1...Ke1
        • 2.Qc1#
      • 1...exf6+!
  • Keys
    • 1.Bd2!
      • threat
        • 2.Qf4#
      • 1...exf6+
        • 2.Qxf6#
      • 1...exd6
        • 2.Re1#
      • 1...e5
        • 2.Se3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • B(F);CHECK,N_SPINS(D),XR(b)
      • Vars
        • K(a);P-FLIGHT::R(A)
      • Refutation
        • P(c);XB(F)
    • Try
      • R(A);CHECK
      • Vars
        • K(a);N_SPINR(b),P-FLIGHT::QAB1(G)
      • Refutation
        • K(a);N_SPINR(b),P-FLIGHT
    • Try
      • Q(G);
      • Threat
        • DUALS(3)
      • Refutation
        • P(d);CHECK,XP(H)
    • Try
      • Q(G);
      • Threat
        • DUALS(2)
      • Vars
        • K(a);N_SPINR(b),P-FLIGHT::QAR2(G)
      • Refutation
        • P(d);CHECK,XP(H)
    • Try
      • Q(G);N_SPINS(D)
      • Threat
        • QAR(G)
      • Vars
        • K(a);N_SPINR(b),P-FLIGHT::QAR2(G)
      • Refutation
        • P(d);CHECK,XP(H)
    • Try
      • Q(G);XP(c)
      • Threat
        • QAR(G)
      • Vars
        • K(a);N_SPINR(b),P-FLIGHT::QAR2(G)
      • Refutation
        • P(d);CHECK,XP(H)
  • Actual
    • B(B);
    • Threat
      • QAR(G)
    • Vars
      • P(d);CHECK,OGATE,XP(H)::QAR(G),XP(d)
      • P(d);OGATE,XQ(G)::R1(I)
      • P(d);N_PINS(D)::S(D)
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