MESON Chess Problem Database

Problem Display
PID: 67044 (8/8/8/Q3p3/pR6/2pk4/8/4K3 w - - 0 1)

Kozhakin, Vladimir Vladimirovich

Problem Observer, 2006

8/8/8/Q3p3/pR6/2pk4/8/4K3

#2

3 + 4

SOLUTION

  • SOUND
  • Tries
    • 1.Qd8+?
      • 1...Kc2
        • 2.Qd1#
      • 1...Ke3!
    • 1.Qb5+?
      • 1...Ke3
        • 2.Qe2#
      • 1...Kc2!
    • 1.Qxe5?
      • threat
        • 2.Qe2#
        • 2.Qe4#
      • 1...c2
        • 2.Qg3#
        • 2.Qd4#
      • 1...Kc2!
    • 1.Qa6+?
      • 1...Ke3
        • 2.Qe2#
      • 1...Kc2!
    • 1.Qa8?
      • threat
        • 2.Qe4#
      • 1...Ke3
        • 2.Qe4#
      • 1...e4
        • 2.Qxe4#
      • 1...c2
        • 2.Qf3#
      • 1...Kc2!
  • Keys
    • 1.Qd5+!
      • 1...Kc2
        • 2.Qd1#
      • 1...Ke3
        • 2.Qe4#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(C);CHECK
      • Vars
        • K(b);OGATE,S_FLIGHT::QAB1(C)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(C);CHECK
      • Vars
        • K(b);OGATE,P-FLIGHT::QAR1(C)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(C);XP(d)
      • Threat
        • DUALS(2)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(C);CHECK
      • Vars
        • K(b);OGATE,P-FLIGHT::QAR1(C)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(C);
      • Threat
        • QAB1(C)
      • Vars
        • K(b);P-FLIGHT::QAR1(C)
        • P(d);::QAB1(C),XP(d)
        • P(a);SBLOCK::QAR2(C)
      • Refutation
        • K(b);S_FLIGHT
  • Actual
    • Q(C);CHECK
    • Vars
      • K(b);OGATE,S_FLIGHT::QAB1(C)
      • K(b);P-FLIGHT::QAR1(C)
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