MESON Chess Problem Database

Problem Display
PID: 203778 (1NK5/7Q/1kp5/8/8/P7/8/8 w - - 0 1)

von Dehn, Bodo

Die Schwalbe, 1931

1NK5/7Q/1kp5/8/8/P7/8/8

#2

4 + 2

15148 Sadier Collection 2020
5454 Near Snap 2021

SOLUTION

  • SOUND
  • Tries
    • 1.Qb1+?
      • 1...Ka5
        • 2.Qb4#
      • 1...Ka7
        • 2.Qb7#
      • 1...Kc5!
    • 1.Qf5?
      • 1...Ka7
        • 2.Qa5#
      • 1...c5!
    • 1.Qh5?
      • 1...Ka7
        • 2.Qa5#
      • 1...c5!
    • 1.Qb7+?
      • 1...Ka5
        • 2.Qa6#
        • 2.Qb4#
      • 1...Kc5!
    • 1.Qe7?
      • 1...Ka5
        • 2.Qb4#
      • 1...Kb5
        • 2.Qb4#
      • 1...c5!
  • Keys
    • 1.Qd3!
      • 1...Ka5
        • 2.Qa6#
      • 1...Kc5
        • 2.Sd7#
      • 1...Ka7
        • 2.Qa6#
      • 1...c5
        • 2.Qa6#

This anticipates 169935(1945)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(B);CHECK
      • Vars
        • K(a);S_FLIGHT::QAB1(B)
        • K(a);OGATE,S_FLIGHT::QAR1(B)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(B);
      • Vars
        • K(a);S_FLIGHT::QAR2(B)
      • Refutation
        • P(b);
    • Try
      • Q(B);
      • Vars
        • K(a);S_FLIGHT::QAR2(B)
      • Refutation
        • P(b);
    • Try
      • Q(B);CHECK
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(B);
      • Vars
        • K(a);S_FLIGHT::QAB1(B)
        • K(a);P-FLIGHT::QAR1(B)
      • Refutation
        • P(b);
  • Actual
    • Q(B);
    • Vars
      • K(a);S_FLIGHT::QAR1(B)
      • K(a);S_FLIGHT::S(C)
      • P(b);SBLOCK::QAR1(B)
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