MESON Chess Problem Database

Problem Display
PID: 227694 (8/8/2K5/8/k7/b1P5/Q7/8 w - - 0 1)

Schiffert, Gyorgy

Toth, Gyula

Magyar Sakkvilag, 1926

8/8/2K5/8/k7/b1P5/Q7/8

#2

3 + 2

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Ka5
      • 2.Qxa3#
  • Tries
    • 1.Qb3+?
      • 1...Ka5
        • 2.Qxa3#
        • 2.Qb5#
      • 1...Kxb3!
    • 1.Qa1?
      • 1...Ka5
        • 2.Qxa3#
      • 1...Kb3!
    • 1.c4?
      • 1...Ka5
        • 2.Qxa3#
      • 1...Kb4!
  • Keys
    • 1.Qc4+!
      • 1...Ka5
        • 2.Qb5#
      • 1...Bb4
        • 2.Qxb4#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • K(b);P-FLIGHT::QAR2(A),XB(a)
  • Tries
    • Try
      • Q(A);CHECK,N_PINB(a)
      • Refutation
        • K(b);S_FLIGHT,XQ(A)
    • Try
      • Q(A);
      • Vars
        • K(b);P-FLIGHT::QAR2(A),XB(a)
      • Refutation
        • K(b);N_SPINB(a),S_FLIGHT
    • Try
      • P(B);
      • Vars
        • K(b);P-FLIGHT::QAR2(A),XB(a)
      • Refutation
        • K(b);N_SPINB(a),P-FLIGHT
  • Actual
    • Q(A);CHECK,N_PINB(a)
    • Vars
      • K(b);P-FLIGHT::QAR1(A)
      • B(a);N_GUARD,P_SPINB(a)::QAR1(A),XB(a)
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