MESON Chess Problem Database

Problem Display
PID: 203643 (8/8/2p5/4P3/1Qpk1P2/K1N5/4PP2/8 w - - 0 1)

Henke, Walter

Arbeiter Schachzeitung, 1924

8/8/2p5/4P3/1Qpk1P2/K1N5/4PP2/8

#2

7 + 3

5454 Near Snap 2020
6490 yacpdb 2020

SOLUTION

  • SOUND
  • Tries
    • 1.Qb2?
      • 1...c5
        • 2.Qd2#
      • 1...Kc5!
    • 1.Qb6+?
      • 1...Kxc3
        • 2.Qb2#
      • 1...c5!
    • 1.Qb8?
      • 1...Kxc3
        • 2.Qb2#
      • 1...Kc5
        • 2.Qa7#
      • 1...c5!
  • Keys
    • 1.Qb7!
      • 1...Kxc3
        • 2.Qb2#
      • 1...Kc5
        • 2.Qa7#
      • 1...c5
        • 2.Sb5#

Anticipated by 118300(1896), 187817(1909)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(E);N_PINP(a)
      • Vars
        • P(c);SBLOCK::QAR2(E)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(E);CHECK,N_PINP(a)
      • Vars
        • K(b);OGATEB,S_FLIGHT,XS(D)::QAB1(E)
      • Refutation
        • P(c);P_SPINP(c)
    • Try
      • Q(E);N_PINP(a)
      • Vars
        • K(b);OGATEB,S_FLIGHT,XS(D)::QAB1(E)
        • K(b);S_FLIGHT::QAB(E)
      • Refutation
        • P(c);
  • Actual
    • Q(E);N_PINP(a)
    • Vars
      • K(b);OGATEB,S_FLIGHT,XS(D)::QAB1(E)
      • K(b);S_FLIGHT::QAB(E)
      • P(c);N_GUARD,SBLOCK::S(D)
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