MESON Chess Problem Database

Problem Display
PID: 230782 (5K2/5B2/5k2/4r3/3Q4/6P1/8/8 w - - 0 1)

Speckmann, Werner

The Problemist, 1988

5K2/5B2/5k2/4r3/3Q4/6P1/8/8

#2

4 + 2

SOLUTION

  • SOUND
  • Sets
    • 1...Kf5
      • 2.Qf4#
    • 1...Kg5
      • 2.Qf4#
  • Tries
    • 1.Kg8?
      • 1...Kf5
        • 2.Qf4#
      • 1...Kg5
        • 2.Qf4#
      • 1...Ke7!
    • 1.Qf2+?
      • 1...Kg5
        • 2.Qf4#
      • 1...Rf5!
    • 1.Qb6+?
      • 1...Kf5
        • 2.Qg6#
      • 1...Kg5
        • 2.Qg6#
      • 1...Re6!
    • 1.Qh4+?
      • 1...Kf5
        • 2.Qf4#
      • 1...Rg5!
  • Keys
    • 1.Qd6+!
      • 1...Kf5
        • 2.Qg6#
      • 1...Kg5
        • 2.Qg6#
      • 1...Re6
        • 2.Qf4#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • K(b);N_SPINR(a),P-FLIGHT::QAR1(B)
    • K(b);N_SPINR(a),S_FLIGHT::QAB1(B)
  • Tries
    • Try
      • K(D);P-FLIGHT
      • Vars
        • K(b);N_SPINR(a),P-FLIGHT::QAR1(B)
        • K(b);N_SPINR(a),S_FLIGHT::QAB1(B)
      • Refutation
        • K(b);N_SPINR(a),S_FLIGHT
    • Try
      • Q(B);CHECK,N_PINR(a)
      • Vars
        • K(b);S_FLIGHT::QAB1(B)
      • Refutation
        • R(a);P_SPINR(a)
    • Try
      • Q(B);CHECK,N_PINR(a)
      • Vars
        • K(b);OGATE,P-FLIGHT::QAB1(B)
        • K(b);OGATE,S_FLIGHT::QAR1(B)
      • Refutation
        • R(a);P_SPINR(a)
    • Try
      • Q(B);CHECK,N_PINR(a)
      • Vars
        • K(b);P-FLIGHT::QAR1(B)
      • Refutation
        • R(a);P_SPINR(a)
  • Actual
    • Q(B);CHECK,N_PINR(a)
    • Vars
      • K(b);OGATE,P-FLIGHT::QAB1(B)
      • K(b);OGATE,S_FLIGHT::QAR1(B)
      • R(a);OGATE,P_SPINR(a)::QAR2(B)
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