MESON Chess Problem Database

Problem Display
PID: 149205 (2N5/Nk6/4K3/8/3Q4/8/8/8 w - - 0 1)

Dehler, Ernst Georg

Deutsche Schachzeitung, 1925

2N5/Nk6/4K3/8/3Q4/8/8/8

#2

4 + 1

81 Chess 1960
15148 Sadier Collection 2013
5454 Near Snap 2014
3713 Snap 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Ka6
      • 2.Qb6#
    • 1...Kc7
      • 2.Qb6#
  • Tries
    • 1.Qb2+?
      • 1...Ka6
        • 2.Qb5#
        • 2.Qb6#
      • 1...Kc7
        • 2.Qb6#
      • 1...Ka8!
    • 1.Qe5?
      • 1...Ka6
        • 2.Qb5#
      • 1...Ka8!
    • 1.Qb4+?
      • 1...Ka6
        • 2.Qb5#
        • 2.Qb6#
      • 1...Kc7
        • 2.Qb6#
      • 1...Ka8!
  • Keys
    • 1.Sc6!
      • 1...Ka6
        • 2.Qb6#
      • 1...Kxc6
        • 2.Qb6#
      • 1...Kc7
        • 2.Qd7#
      • 1...Ka8
        • 2.Qa7#
      • 1...Kxc8
        • 2.Qd7#

This anticipates 220699(1928), 78121(1957)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • K(a);S_FLIGHT::QAR1(A)
    • K(a);P-FLIGHT::QAB1(A)
  • Tries
    • Try
      • Q(A);CHECK
      • Vars
        • K(a);P-FLIGHT::QAB1(A)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(A);
      • Vars
        • K(a);S_FLIGHT::QAB1(A)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(A);CHECK
      • Vars
        • K(a);P-FLIGHT::QAB1(A)
      • Refutation
        • K(a);S_FLIGHT
  • Actual
    • S(C);
    • Vars
      • K(a);S_FLIGHT::QAR1(A)
      • K(a);S_FLIGHT,XS(C)::QAR1(A)
      • K(a);P-FLIGHT::QAR1(A)
      • K(a);S_FLIGHT,XS(D)::QAB1(A)
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