MESON Chess Problem Database

Problem Display
PID: 121534 (8/3p4/2PP1R2/KQpk4/8/2PP4/8/8 w - - 0 1)

Owen, Leonard E

Deutsche Schachzeitung, 1909

8/3p4/2PP1R2/KQpk4/8/2PP4/8/8

#2

7 + 3

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Tries
    • 1.Qa4?
      • threat
        • 2.Qe4#
      • 1...c4
        • 2.Qb5#
      • 1...Ke5!
    • 1.Qc4+?
      • 1...Kxc6
        • 2.Qe4#
      • 1...Ke5!
    • 1.c4+?
      • 1...Ke5
        • 2.Qb2#
      • 1...Kd4!
  • Keys
    • 1.Qb2!
      • 1...Ke5
        • 2.c4#
      • 1...Kxc6
        • 2.Qg2#
      • 1...dxc6
        • 2.c4#
      • 1...c4
        • 2.Qb5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(D);N_PINP(a)
      • Threat
        • QAB1(D)
      • Vars
        • P(a);OGATEB::QAR2(D)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(D);CHECK,N_PINP(a)
      • Vars
        • K(b);P_SPINP(a),S_FLIGHT,XP(E)::QAB(D)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • P(A);CHECK
      • Vars
        • K(b);P-FLIGHT::QAB(D)
      • Refutation
        • K(b);N_SPINP(a),P-FLIGHT
  • Actual
    • Q(D);N_PINP(a)
    • Vars
      • K(b);P-FLIGHT::QAB(D)+P(A)
      • K(b);S_FLIGHT,XP(E)::QAB(D)
      • P(c);SBLOCK,XP(E)::P(A)
      • P(a);OGATEB::QAR2(D)
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