MESON Chess Problem Database

Problem Display
PID: 190190 (7k/7b/5Np1/6N1/8/8/1KQ5/8 w - - 0 1)

de Koning, Josef JM

Magyar Sakkvilag, 1913

7k/7b/5Np1/6N1/8/8/1KQ5/8

#2

4 + 3

6490 yacpdb 2019

SOLUTION

  • SOUND
  • Tries
    • 1.Se6?
      • 1...g5
        • 2.Qxh7#
      • 1...Bg8!
    • 1.Se8?
      • 1...Bg8
        • 2.Qc3#
      • 1...Kg8!
    • 1.Qb3?
      • 1...Bg8
        • 2.Qxg8#
      • 1...Kg7!
    • 1.Qxg6?
      • threat
        • 2.Sf7#
        • 2.Qxh7#
      • 1...Bg8
        • 2.Qxg8#
      • 1...Bxg6!
    • 1.Qc3?
      • 1...Bg8
        • 2.Sfe4#
        • 2.Sg4#
        • 2.Sd5#
        • 2.Sh5#
        • 2.Sd7#
        • 2.Sfh7#
        • 2.Se8#
      • 1...Kg7!
    • 1.Qc4?
      • 1...Bg8
        • 2.Qxg8#
      • 1...Kg7!
    • 1.Qc8+?
      • 1...Bg8
        • 2.Qxg8#
      • 1...Kg7!
  • Keys
    • 1.Sh5!
      • 1...Kg8
        • 2.Qc8#
      • 1...gxh5
        • 2.Qxh7#
      • 1...Bg8
        • 2.Qc3#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(C);
      • Vars
        • P(a);OGATE::QAR1(B),XB(b)
      • Refutation
        • B(b);
    • Try
      • S(D);
      • Vars
        • B(b);SBLOCK::QAB(B)
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • Q(B);
      • Vars
        • B(b);N_GUARD::QAR1(B),XB(b)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • Q(B);XP(a)
      • Threat
        • DUALS(2)
      • Vars
        • B(b);N_GUARD::QAR1(B),XB(b)
      • Refutation
        • B(b);XQ(B)
    • Try
      • Q(B);
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • Q(B);
      • Vars
        • B(b);N_GUARD::QAR1(B),XB(b)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • Q(B);CHECK
      • Vars
        • B(b);N_GUARD,P_SPINB(b)::QAR1(B),XB(b)
      • Refutation
        • K(c);S_FLIGHT
  • Actual
    • S(D);
    • Vars
      • K(c);P-FLIGHT::QAR(B)
      • P(a);OGATE,XS(D)::QAR1(B),XB(b)
      • B(b);SBLOCK::QAB(B)
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