MESON Chess Problem Database

Problem Display
PID: 231411 (8/8/8/8/6p1/4B1p1/3K2k1/Q7 w - - 0 1)

Langweil, Walter

Lindgren, Frithiof

Chemnitzer Tageblatt, 1927

8/8/8/8/6p1/4B1p1/3K2k1/Q7

#2

3 + 3

3713 Snap 2021
6490 yacpdb 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Kf3
      • 2.Qa8#
    • 1...Kh3
      • 2.Qh1#
  • Tries
    • 1.Ke2?
      • 1...Kh3
        • 2.Qh1#
      • 1...Kh2!
    • 1.Kd3?
      • 1...Kf3
        • 2.Qf1#
        • 2.Qa8#
      • 1...Kh3
        • 2.Qh1#
      • 1...Kh2!
    • 1.Qb1?
      • 1...Kf3
        • 2.Qb7#
      • 1...Kh3
        • 2.Qh1#
      • 1...Kh2!
    • 1.Qc1?
      • 1...Kf3
        • 2.Qc6#
      • 1...Kh3
        • 2.Qh1#
      • 1...Kh2!
    • 1.Qd1?
      • 1...Kh3
        • 2.Qh1#
      • 1...Kh2!
    • 1.Qg1+?
      • 1...Kh3
        • 2.Qh1#
      • 1...Kf3!
    • 1.Qa8+?
      • 1...Kf1
        • 2.Qh1#
      • 1...Kh3
        • 2.Qh1#
      • 1...Kh2!
  • Keys
    • 1.Qh8!
      • 1...Kf1
        • 2.Qh1#
      • 1...Kf3
        • 2.Qa8#

This anticipates 3214(1985-1986), 135396(2004)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • K(a);S_FLIGHT::QAB(A)
    • K(a);S_FLIGHT::QAR2(A)
  • Tries
    • Try
      • K(B);P-FLIGHT
      • Vars
        • K(a);S_FLIGHT::QAR2(A)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • K(B);P-FLIGHT
      • Vars
        • K(a);S_FLIGHT::QAR2(A)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(A);
      • Vars
        • K(a);S_FLIGHT::QAB(A)
        • K(a);S_FLIGHT::QAR2(A)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(A);
      • Vars
        • K(a);S_FLIGHT::QAB(A)
        • K(a);S_FLIGHT::QAR2(A)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(A);
      • Vars
        • K(a);S_FLIGHT::QAR2(A)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(A);CHECK
      • Vars
        • K(a);S_FLIGHT::QAR2(A)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(A);CHECK
      • Vars
        • K(a);OGATE,S_FLIGHT::QAR2(A)
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • Q(A);
    • Vars
      • K(a);S_FLIGHT::QAR2(A)
      • K(a);S_FLIGHT::QAB(A)
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