MESON Chess Problem Database

Problem Display
PID: 227778 (8/8/8/8/4p3/4p2p/4Q3/5K1k w - - 0 1)

Schonberger, Tibor

Magyar Sakkvilag, 1926

8/8/8/8/4p3/4p2p/4Q3/5K1k

#2

2 + 4

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...h2
      • 2.Qg2#
  • Tries
    • 1.Ke1?
      • 1...h2
        • 2.Qf1#
      • 1...Kg1!
    • 1.Qg4?
      • threat
        • 2.Qxh3#
        • 2.Qg1#
      • 1...Kh2
        • 2.Qg1#
      • 1...h2
        • 2.Qg2#
        • 2.Qxe4#
      • 1...e2+!
    • 1.Qa2?
      • 1...h2
        • 2.Qg2#
      • 1...e2+!
    • 1.Qb2?
      • 1...h2
        • 2.Qg2#
      • 1...e2+!
    • 1.Qc2?
      • 1...h2
        • 2.Qxe4#
        • 2.Qg2#
      • 1...e2+!
  • Keys
    • 1.Qxe3!
      • threat
        • 2.Qg1#
        • 2.Qxh3#
      • 1...Kh2
        • 2.Qg1#
      • 1...h2
        • 2.Qxe4#

FEATURES

  • Static
    • TYPE = BLOCK_THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • P(c);N_GUARD::QAB1(B)
  • Tries
    • Try
      • K(A);P-FLIGHT
      • Vars
        • P(c);SBLOCK::QAR2(B)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(B);
      • Threat
        • DUALS(2)
      • Vars
        • K(a);P-FLIGHT::QAB1(B)
      • Refutation
        • P(b);CHECK
    • Try
      • Q(B);
      • Vars
        • P(c);N_GUARD::QAB1(B)
      • Refutation
        • P(b);CHECK
    • Try
      • Q(B);
      • Vars
        • P(c);N_GUARD::QAB1(B)
      • Refutation
        • P(b);CHECK
    • Try
      • Q(B);
      • Refutation
        • P(b);CHECK
  • Actual
    • Q(B);XP(b)
    • Threat
      • DUALS(2)
    • Vars
      • K(a);P-FLIGHT::QAB1(B)
      • P(c);SBLOCK::QAB(B),XP(d)
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