MESON Chess Problem Database

Problem Display
PID: 206720 (8/8/8/1p6/1N1Q4/8/1r3p2/k4K2 w - - 0 1)

Schonberger, Tibor

Magyar Sakkvilag, 1925

8/8/8/1p6/1N1Q4/8/1r3p2/k4K2

#2

3 + 4

6490 yacpdb 2020
5454 Near Snap 2023

SOLUTION

  • SOUND
  • Sets
    • 1...Kb1
      • 2.Qd1#
  • Tries
    • 1.Qa7+?
      • 1...Ra2
        • 2.Qxa2#
      • 1...Kb1!
  • Keys
    • 1.Sd3!
      • threat
        • 2.Qxb2#
      • 1...Kb1
        • 2.Qxb2#
      • 1...Ka2
        • 2.Qxb2#

This anticipates 241954(1933), 212395(1976)

FEATURES

  • Static
    • TYPE = BLOCK_THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • K(a);N_SPINR(b),P-FLIGHT::QAR2(C)
  • Tries
    • Try
      • Q(C);CHECK,N_PINR(b)
      • Vars
        • R(b);N_GUARD,P_SPINR(b)::QAR1(C),XR(b)
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • S(B);
    • Threat
      • QAB1(C),XR(b)
    • Vars
      • K(a);N_SPINR(b),P-FLIGHT::QAR1(C),XR(b)
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