MESON Chess Problem Database

Problem Display
PID: 209154 (8/2p5/Q7/8/1k2P3/1P2K3/8/1R6 w - - 0 1)

Groeneveld, Cornelis

Deutsche Schachblatter, 1983

8/2p5/Q7/8/1k2P3/1P2K3/8/1R6

#2

5 + 2

15148 Sadier Collection 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Kc3
      • 2.Qc4#
    • 1...Kc5
      • 2.b4#
  • Tries
    • 1.Kd3?
      • 1...Kc5
        • 2.b4#
      • 1...c5
        • 2.Qa4#
      • 1...c6!
    • 1.Qc4+?
      • 1...Ka3
        • 2.Qa4#
      • 1...Ka5!
    • 1.Qb5+?
      • 1...Ka3
        • 2.Qa4#
        • 2.Qa5#
      • 1...Kc3
        • 2.Qc4#
        • 2.Qc5#
      • 1...Kxb5!
    • 1.Qa4+?
      • 1...Kc3
        • 2.Qc4#
      • 1...Kc5!
    • 1.Qb6+?
      • 1...Ka3
        • 2.Qa5#
      • 1...Kc3
        • 2.Qc5#
      • 1...cxb6!
  • Keys
    • 1.Qc6!
      • 1...Ka3
        • 2.Qa4#
      • 1...Ka5
        • 2.b4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • K(a);S_FLIGHT::QAR1(E)
    • K(a);OGATE,S_FLIGHT::P(B)
  • Tries
    • Try
      • K(C);P-FLIGHT
      • Vars
        • K(a);OGATE,S_FLIGHT::P(B)
        • P(b);SBLOCK::QAR1(E)
      • Refutation
        • P(b);
    • Try
      • Q(E);CHECK
      • Vars
        • K(a);OGATE,S_FLIGHT::QAR1(E)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(E);CHECK
      • Refutation
        • K(a);P-FLIGHT,XQ(E)
    • Try
      • Q(E);CHECK
      • Vars
        • K(a);OGATE,S_FLIGHT::QAR1(E)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(E);CHECK
      • Vars
        • K(a);S_FLIGHT::QAR2(E)
      • Refutation
        • P(b);XQ(E)
  • Actual
    • Q(E);
    • Vars
      • K(a);S_FLIGHT::QAR1(E)
      • K(a);OGATE,S_FLIGHT::P(B)
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