MESON Chess Problem Database

Problem Display
PID: 205712 (4krQ1/3p3P/3K4/8/8/8/8/8 w - - 0 1)

Schonberger, Tibor

Magyar Sakkvilag, 1925

4krQ1/3p3P/3K4/8/8/8/8/8

#2

3 + 3

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Kd8
      • 2.Qxf8#
    • 1...Rxg8
      • 2.hxg8Q#
  • Tries
    • 1.Qe6+?
      • 1...Kd8
        • 2.Qxd7#
      • 1...dxe6!
    • 1.Qg6+?
      • 1...Rf7
        • 2.h8Q#
        • 2.h8R#
      • 1...Kd8!
    • 1.h8S?
      • 1...Kd8
        • 2.Qxf8#
      • 1...Rxg8!
    • 1.h8B?
      • 1...Kd8
        • 2.Qxf8#
      • 1...Rxg8!
    • 1.h8R?
      • threat
        • 2.Qxf8#
      • 1...Kd8
        • 2.Qxf8#
      • 1...Rxg8!
  • Keys
    • 1.h8Q!
      • threat
        • 2.Qxf8#
      • 1...Kd8
        • 2.Qxf8#
      • 1...Rxg8
        • 2.Qxg8#

FEATURES

  • Static
    • TYPE = BLOCK_THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • K(b);P-FLIGHT::QAR2(C),XR(c)
    • R(c);N_SPINR(c),OGATE,XQ(C)::PXR(c)=Q
  • Tries
    • Try
      • Q(C);CHECK,N_PINR(c)
      • Vars
        • K(b);P-FLIGHT::QAR1(C),XP(a)
      • Refutation
        • P(a);XQ(C)
    • Try
      • Q(C);CHECK,N_PINR(c)
      • Vars
        • R(c);P_SPINR(c)::P=Q
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • P(B);
      • Vars
        • K(b);P-FLIGHT::QAR2(C),XR(c)
      • Refutation
        • R(c);N_SPINR(c),XQ(C)
    • Try
      • P(B);
      • Vars
        • K(b);P-FLIGHT::QAR2(C),XR(c)
      • Refutation
        • R(c);N_SPINR(c),XQ(C)
    • Try
      • P(B);
      • Threat
        • QAR1(C),XR(c)
      • Vars
        • K(b);P-FLIGHT::QAR2(C),XR(c)
      • Refutation
        • R(c);XQ(C)
  • Actual
    • P(B);
    • Threat
      • QAR1(C),XR(c)
    • Vars
      • K(b);P-FLIGHT::QAR2(C),XR(c)
      • R(c);OGATE,XQ(C)::QAR2(B),XR(c)
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