MESON Chess Problem Database

Problem Display
PID: 166288 (1b3Q2/1N6/2rr4/1p6/p1k3B1/2Np3R/K7/2R5 w - - 0 1)

Gulyaev, Aleksandr Pavlovich (aka Grin, AP)

13th Prize, Smena, 1932

1b3Q2/1N6/2rr4/1p6/p1k3B1/2Np3R/K7/2R5

#2

7 + 7

145 StrateGems 2016

SOLUTION

  • SOUND
  • Sets
    • 1...Kb4
      • 2.Sd5#
    • 1...Kd4
      • 2.Qf4#
    • 1...Rd4
      • 2.Sa5#
    • 1...Rd5
      • 2.Se2#
  • Tries
    • 1.Se2+?
      • 1...Kd5
        • 2.Qf5#
      • 1...Kb4!
    • 1.Be6+?
      • 1...Kb4
        • 2.Sd5#
      • 1...Kd4
        • 2.Qg7#
        • 2.Qf4#
        • 2.Qf6#
        • 2.Qh8#
      • 1...Rd5
        • 2.Se2#
      • 1...Rxe6!
  • Keys
    • 1.Rh4!
      • threat
        • 2.Be6#
      • 1...Kb4
        • 2.Sd5#
      • 1...Kd4
        • 2.Qf4#
      • 1...d2
        • 2.Be2#
      • 1...Rd4
        • 2.Sa5#
      • 1...Rd5
        • 2.Se2#
      • 1...Re6
        • 2.Bxe6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • K(c);P-FLIGHT,P_SPINR(f)::S(C)
    • K(c);P-FLIGHT::QAR2(G)
    • R(f);SBLOCK::S(F)
    • R(f);SBLOCK::R(A)+S(C)
  • Tries
    • Try
      • S(C);CHECK
      • Vars
        • K(c);S_FLIGHT::QAR2(G)
      • Refutation
        • K(c);P-FLIGHT,P_SPINR(f)
    • Try
      • B(E);CHECK
      • Vars
        • K(c);P-FLIGHT,P_SPINR(f)::S(C)
        • R(f);P_SPINR(f)::R(A)+S(C)
      • Refutation
        • R(f);XB(E)
  • Actual
    • R(D);
    • Threat
      • R(D)+B(E),DCHECK
    • Vars
      • K(c);P-FLIGHT,P_SPINR(f)::S(C)
      • K(c);P-FLIGHT::QAR2(G)
      • P(a);::R(D)+B(E),DCHECK
      • R(f);SBLOCK::S(F)
      • R(f);SBLOCK::R(A)+S(C)
      • R(f);::R(D)+B(E),DCHECK,XR(f)
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