MESON Chess Problem Database

Problem Display
PID: 86957 (8/8/8/8/1nQPk1K1/8/4pB2/8 w - - 0 1)

Kovalenko, Vitaly Semenovich

Kudesnik, 1997

8/8/8/8/1nQPk1K1/8/4pB2/8

#2

4 + 3

6490 yacpdb 2009
5454 Near Snap 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Sd3
      • 2.Qc6#
    • 1...Sd5
      • 2.Qc2#
  • Tries
    • 1.Qb3?
      • threat
        • 2.Qf3#
      • 1...Sd3
        • 2.Qb7#
      • 1...e1S!
    • 1.Qf7?
      • threat
        • 2.Qf3#
        • 2.Qf5#
      • 1...e1S
        • 2.Qf5#
      • 1...Kd3!
    • 1.Qc5?
      • threat
        • 2.Qf5#
      • 1...Sd5
        • 2.Qc2#
      • 1...Kd3!
  • Keys
    • 1.Qb5!
      • threat
        • 2.Qf5#
      • 1...Sd5
        • 2.Qb1#

Anticipated by 171295(1987)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 0
    • REMOVED MATES = 1
  • Sets
    • S(b);N_GUARD,SBLOCK::QAB(B)
  • Tries
    • Try
      • Q(B);
      • Threat
        • QAB1(B)
      • Vars
        • S(b);OGATE,SBLOCK::QAB(B)
      • Refutation
        • P(a);
    • Try
      • Q(B);
      • Threat
        • DUALS(2)
      • Vars
        • P(a);::QAB1(B)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • Q(B);
      • Threat
        • QAB1(B)
      • Vars
        • S(b);N_GUARD,SBLOCK::QAB(B)
      • Refutation
        • K(c);S_FLIGHT
  • Actual
    • Q(B);
    • Threat
      • QAB1(B)
    • Vars
      • S(b);OGATE,SBLOCK::QAB(B)
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