MESON Chess Problem Database

Problem Display
PID: 46966 (3R4/B1p5/8/1k2K3/8/Q1r5/8/8 w - - 0 1)

Kovalenko, Vitaly Semenovich

Primorje-Moldau, 1971

3R4/B1p5/8/1k2K3/8/Q1r5/8/8

#2

4 + 3

4883 Still More Fun with Chess Miniatures 2002

SOLUTION

  • SOUND
  • Sets
    • 1...Kc4
      • 2.Qa4#
    • 1...Kc6
      • 2.Qa6#
  • Tries
    • 1.Rd5+?
      • 1...Kc4
        • 2.Qa4#
      • 1...Kc6
        • 2.Qa6#
      • 1...Rc5
        • 2.Rxc5#
      • 1...c5!
    • 1.Qa5+?
      • 1...Kc4
        • 2.Qa4#
      • 1...Kc6
        • 2.Qd5#
        • 2.Qa6#
      • 1...Kxa5!
    • 1.Qa6+?
      • 1...Kb4
        • 2.Rb8#
      • 1...Kxa6!
  • Keys
    • 1.Rb8+!
      • 1...Kc4
        • 2.Qa6#
      • 1...Kc6
        • 2.Qa4#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 2
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • K(b);S_FLIGHT::QAR2(A)
  • Tries
    • Try
      • R(D);CHECK
      • Vars
        • K(b);S_FLIGHT::QAR2(A)
        • R(a);N_GUARD,P_PINR(D),P_SPINR(a)::R1(D),XR(a)
      • Refutation
        • P(c);P_SPINP(c)
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);S_FLIGHT::QAR2(A)
      • Refutation
        • K(b);P-FLIGHT,XQ(A)
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);P-FLIGHT::R(D)
      • Refutation
        • K(b);S_FLIGHT,XQ(A)
  • Actual
    • R(D);CHECK
    • Vars
      • K(b);S_FLIGHT::QAB(A)
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