MESON Chess Problem Database

Problem Display
PID: 2154 (4Q3/8/8/4p3/3NkN2/8/4K3/8 w - - 0 1)

Cabrera, Darwin

Chess, 1964

4Q3/8/8/4p3/3NkN2/8/4K3/8

#2

4 + 2

5454 Near Snap 2009

SOLUTION

  • SOUND
  • Tries
    • 1.Sde6?
      • threat
        • 2.Qg6#
      • 1...Kf5
        • 2.Qg6#
      • 1...exf4!
    • 1.Sfe6?
      • threat
        • 2.Qc6#
        • 2.Qa8#
      • 1...Kd5
        • 2.Qc6#
      • 1...exd4!
    • 1.Qc6+?
      • 1...Kxd4
        • 2.Se6#
      • 1...Kxf4!
    • 1.Qg6+?
      • 1...Kxf4
        • 2.Se6#
      • 1...Kxd4!
  • Keys
    • 1.Qe7!
      • 1...Kxd4
        • 2.Qb4#
      • 1...Kxf4
        • 2.Qh4#

Anticipated by 23002(1881), 222665(1884), 194199(1917), 169805(1945)

This anticipates 109480(1986), 103549(2006)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(B);N_PINP(b)
      • Threat
        • QAB(D)
      • Vars
        • K(a);S_FLIGHT::QAB1(D)
      • Refutation
        • P(b);XS(C)
    • Try
      • S(C);N_PINP(b)
      • Threat
        • DUALS(2)
      • Vars
        • K(a);S_FLIGHT::QAB1(D)
      • Refutation
        • P(b);XS(B)
    • Try
      • Q(D);CHECK,N_PINP(b)
      • Vars
        • K(a);P-FLIGHT,XS(B)::S(C)
      • Refutation
        • K(a);P-FLIGHT,XS(C)
    • Try
      • Q(D);CHECK,N_PINP(b)
      • Vars
        • K(a);P-FLIGHT,XS(C)::S(B)
      • Refutation
        • K(a);P-FLIGHT,XS(B)
  • Actual
    • Q(D);
    • Vars
      • K(a);N_SPINP(b),OGATEB,P-FLIGHT,XS(B)::QAR2(D)
      • K(a);N_SPINP(b),OGATEB,P-FLIGHT,XS(C)::QAR2(D)
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