MESON Chess Problem Database

Problem Display
PID: 9653 (8/6Q1/8/8/1K6/8/8/1kN5 w - - 0 1)

Blumenthal, Oscar

Schweizerische Schachzeitung, 1907

8/6Q1/8/8/1K6/8/8/1kN5

#2

3 + 1

4349 Kleinste Schachaufgaben Drei- und Viersteiner 1970
5454 Near Snap 2019

SOLUTION

  • SOUND
  • Tries
    • 1.Sb3?
      • 1...Ka2
        • 2.Qa1#
      • 1...Kc2!
    • 1.Sd3?
      • threat
        • 2.Qb2#
      • 1...Ka2
        • 2.Qb2#
      • 1...Kc2!
    • 1.Qg2?
      • 1...Ka1
        • 2.Qa2#
      • 1...Kxc1!
  • Keys
    • 1.Kc3!
      • 1...Ka1
        • 2.Kc2#
      • 1...Kxc1
        • 2.Qg1#

Anticipated by 4549(1879)

This anticipates 196940(1919), 152713(1932), 81245(1966)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(A);
      • Vars
        • K(a);S_FLIGHT::QAR1(C)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • S(A);
      • Threat
        • QAR1(C)
      • Vars
        • K(a);S_FLIGHT::QAR1(C)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(C);
      • Vars
        • K(a);P-FLIGHT::QAR1(C)
      • Refutation
        • K(a);P-FLIGHT,XS(A)
  • Actual
    • K(B);S_FLIGHT
    • Vars
      • K(a);P-FLIGHT::QAB(C)+K(B)
      • K(a);OGATEB,P-FLIGHT,XS(A)::QAR(C)
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