MESON Chess Problem Database

Problem Display
PID: 212648 (6R1/8/4K3/3Q4/8/1p6/k7/8 w - - 0 1)

Hultberg, Gustav Herbert

Land og Folk, 1979

6R1/8/4K3/3Q4/8/1p6/k7/8

#2

3 + 2

15148 Sadier Collection 2020

SOLUTION

  • SOUND
  • Tries
    • 1.Qxb3+?
      • 1...Ka1
        • 2.Rg1#
        • 2.Ra8#
      • 1...Kxb3!
    • 1.Qd2+?
      • 1...Ka1
        • 2.Rg1#
      • 1...Kb1
        • 2.Rg1#
      • 1...Ka3
        • 2.Ra8#
      • 1...b2!
  • Keys
    • 1.Rg2+!
      • 1...Ka1
        • 2.Qd1#
      • 1...Kb1
        • 2.Qd1#
      • 1...Ka3
        • 2.Qa5#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(A);CHECK,XP(b)
      • Refutation
        • K(a);S_FLIGHT,XQ(A)
    • Try
      • Q(A);CHECK,N_PINP(b)
      • Vars
        • K(a);P-FLIGHT::R(C)
        • K(a);S_FLIGHT::R(C)
      • Refutation
        • P(b);P_SPINP(b)
  • Actual
    • R(C);CHECK
    • Vars
      • K(a);N_SPINP(b),P-FLIGHT::QAR(A)
      • K(a);N_SPINP(b),S_FLIGHT::QAR2(A)
      • K(a);N_SPINP(b),P-FLIGHT::QAR2(A)
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