MESON Chess Problem Database

Problem Display
PID: 11800 (8/5Q2/8/8/1p1kr3/8/4B3/R3K3 w Q - 0 1)

Pustovoi, Boris

2nd Place, Feledvanykedvelok Lapja, 1972

8/5Q2/8/8/1p1kr3/8/4B3/R3K3

#2

4 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Ke3
      • 2.Qf2#
  • Tries
    • 1.Rd1+?
      • 1...Ke3
        • 2.Rd3#
        • 2.Qf2#
        • 2.Qf3#
      • 1...Kc5
        • 2.Qc7#
      • 1...Ke5
        • 2.Rd5#
      • 1...Kc3!
    • 1.Qf6+?
      • 1...Ke3
        • 2.Qf2#
      • 1...Kc5
        • 2.Ra5#
      • 1...Kd5
        • 2.Ra5#
      • 1...Re5!
  • Keys
    • 1.0-0-0+!
      • 1...Kc3
        • 2.Rd3#
      • 1...Ke3
        • 2.Qf3#
      • 1...Kc5
        • 2.Qc7#
      • 1...Ke5
        • 2.Rd5#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • K(b);N_PINB(C),S_FLIGHT::QAB1(D)
  • Tries
    • Try
      • R(A);CHECK
      • Vars
        • K(b);S_FLIGHT::QAR2(D)
        • K(b);OGATE,S_FLIGHT::R1(A)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(D);CHECK
      • Vars
        • K(b);N_PINB(C),S_FLIGHT::QAB1(D)
        • K(b);S_FLIGHT::R(A)
        • K(b);P-FLIGHT::R(A)
      • Refutation
        • R(c);P_SPINR(c)
  • Actual
    • K(B);0-0-0,CHECK,N_SPINB(C)
    • Vars
      • K(b);S_FLIGHT::R1(A)
      • K(b);S_FLIGHT::QAR1(D)
      • K(b);S_FLIGHT::QAR2(D)
      • K(b);OGATE,S_FLIGHT::R1(A)
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