MESON Chess Problem Database

Problem Display
PID: 11946 (3N4/8/8/pk6/7B/1NQ5/8/7K w - - 0 1)

Bogdanov, Evgeny Mikhailovich

6th Prize, Shakhmaty, 1973

3N4/8/8/pk6/7B/1NQ5/8/7K

#2

5 + 2

3296 Shakhmatny zadachi miniaturi 1987
5454 Near Snap 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Ka6
      • 2.Qxa5#
    • 1...Kb6
      • 2.Qxa5#
  • Tries
    • 1.Be1?
      • threat
        • 2.Qc6#
      • 1...Ka6
        • 2.Qxa5#
      • 1...Kb6
        • 2.Qxa5#
      • 1...Ka4!
    • 1.Qc4+?
      • 1...Kb6
        • 2.Bf2#
      • 1...Kxc4!
    • 1.Qc5+?
      • 1...Ka6
        • 2.Qxa5#
      • 1...Ka4!
  • Keys
    • 1.Be7!
      • threat
        • 2.Qc6#
      • 1...Ka4
        • 2.Qc4#
      • 1...Ka6
        • 2.Qxa5#
      • 1...Kb6
        • 2.Qxa5#

This anticipates 206807(1991)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • K(b);S_FLIGHT::QAR1(C),XP(a)
    • K(b);P-FLIGHT::QAB1(C),XP(a)
  • Tries
    • Try
      • B(D);
      • Threat
        • QAB1(C)
      • Vars
        • K(b);S_FLIGHT::QAR1(C),XP(a)
        • K(b);P-FLIGHT::QAB1(C),XP(a)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(C);CHECK
      • Vars
        • K(b);P-FLIGHT::B(D)
      • Refutation
        • K(b);S_FLIGHT,XQ(C)
    • Try
      • Q(C);CHECK
      • Vars
        • K(b);OGATE,S_FLIGHT::QAR1(C),XP(a)
      • Refutation
        • K(b);S_FLIGHT
  • Actual
    • B(D);
    • Threat
      • QAB1(C)
    • Vars
      • K(b);S_FLIGHT::QAR2(C)
      • K(b);S_FLIGHT::QAR1(C),XP(a)
      • K(b);P-FLIGHT::QAB1(C),XP(a)
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