MESON Chess Problem Database

Problem Display
PID: 153208 (6R1/6nN/6k1/8/7K/4Q3/8/1b6 w - - 0 1)

Lincoln, Robert A

StrateGems, 2011

6R1/6nN/6k1/8/7K/4Q3/8/1b6

#2

4 + 3

SOLUTION

  • SOUND
  • Tries
    • 1.Rxg7+?
      • 1...Kf5
        • 2.Rg5#
      • 1...Kxg7!
    • 1.Qg5+?
      • 1...Kxh7
        • 2.Qxg7#
      • 1...Kf7!
    • 1.Qe8+?
      • 1...Kf5
        • 2.Rf8#
      • 1...Kxh7
        • 2.Rh8#
      • 1...Kh6!
  • Keys
    • 1.Qe5!
      • threat
        • 2.Qh5#
      • 1...Kh6
        • 2.Qxg7#
      • 1...Kf7
        • 2.Rxg7#
      • 1...Kxh7
        • 2.Qxg7#
      • 1...Bf5
        • 2.Qxg7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • R(D);CHECK,XS(c)
      • Vars
        • K(b);OGATE,S_FLIGHT::R1(D)
      • Refutation
        • K(b);P-FLIGHT,XR(D)
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);N_SPINS(c),OGATE,S_FLIGHT,XS(C)::QAR1(A),XS(c)
      • Refutation
        • K(b);N_SPINS(c),S_FLIGHT
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);N_SPINS(c),S_FLIGHT::R(D)
        • K(b);N_SPINS(c),S_FLIGHT,XS(C)::R1(D)
      • Refutation
        • K(b);N_SPINS(c),P-FLIGHT
  • Actual
    • Q(A);
    • Threat
      • QAB1(A)
    • Vars
      • K(b);N_SPINS(c),P-FLIGHT::QAB1(A),XS(c)
      • K(b);N_SPINS(c),S_FLIGHT::R1(D),XS(c)
      • K(b);N_SPINS(c),S_FLIGHT,XS(C)::QAR1(A),XS(c)
      • B(a);SBLOCK::QAR1(A),XS(c)
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