MESON Chess Problem Database

Problem Display
PID: 227934 (8/8/1k2p3/8/B1Q1K3/1p6/8/1R6 w - - 0 1)

Lipton, Michael

Comm., Deutsche Schachzeitung, 1988

8/8/1k2p3/8/B1Q1K3/1p6/8/1R6

#2

4 + 3

15148 Sadier Collection 2020
5454 Near Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Ka5
      • 2.Qb5#
  • Tries
    • 1.Rxb3+?
      • 1...Ka5
        • 2.Qb5#
      • 1...Ka7!
    • 1.Qc6+?
      • 1...Ka5
        • 2.Qb5#
      • 1...Ka7!
  • Keys
    • 1.Qxb3+!
      • 1...Ka5
        • 2.Qb5#
      • 1...Kc5
        • 2.Qb4#
      • 1...Ka6
        • 2.Qb6#
      • 1...Ka7
        • 2.Qb7#
      • 1...Kc7
        • 2.Qb8#

Anticipated by 71073(1964)

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • K(b);N_SPINP(a),S_FLIGHT::QAR1(C)
  • Tries
    • Try
      • R(A);CHECK,XP(a)
      • Vars
        • K(b);S_FLIGHT::QAR1(C)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(C);CHECK
      • Vars
        • K(b);N_SPINP(a),S_FLIGHT::QAR1(C)
      • Refutation
        • K(b);N_SPINP(a),S_FLIGHT
  • Actual
    • Q(C);CHECK,XP(a)
    • Vars
      • K(b);S_FLIGHT::QAR1(C)
      • K(b);S_FLIGHT::QAB1(C)
      • K(b);P-FLIGHT::QAR1(C)
      • K(b);OGATE,S_FLIGHT::QAR1(C)
      • K(b);OGATE,S_FLIGHT::QAB1(C)
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