MESON Chess Problem Database

Problem Display
PID: 86877 (8/3Q4/8/6pp/6Pk/8/7K/3b4 w - - 0 1)

Gerasimenko, Nikolai Mikhailovich

The Problemist, 1976

8/3Q4/8/6pp/6Pk/8/7K/3b4

#2

3 + 4

6490 yacpdb 2009
5454 Near Snap 2022

SOLUTION

  • SOUND
  • Sets
    • 1...hxg4
      • 2.Qh7#
  • Tries
    • 1.Qd3?
      • threat
        • 2.Qg3#
        • 2.Qh3#
      • 1...Kxg4
        • 2.Qe4#
      • 1...Bxg4
        • 2.Qg3#
      • 1...hxg4
        • 2.Qh7#
      • 1...Bf3!
    • 1.Qd6?
      • threat
        • 2.Qg3#
      • 1...hxg4
        • 2.Qh6#
      • 1...Kxg4!
    • 1.Qc7?
      • threat
        • 2.Qg3#
      • 1...hxg4
        • 2.Qh7#
      • 1...Kxg4!
    • 1.Qf7?
      • threat
        • 2.Qxh5#
      • 1...Bxg4
        • 2.Qf2#
      • 1...hxg4
        • 2.Qh7#
      • 1...Kxg4!
    • 1.Qh7?
      • threat
        • 2.Qxh5#
      • 1...Kxg4
        • 2.Qe4#
      • 1...Bxg4!
  • Keys
    • 1.Qe8!
      • threat
        • 2.Qxh5#
      • 1...Kxg4
        • 2.Qe4#
      • 1...Bxg4
        • 2.Qe1#
      • 1...hxg4
        • 2.Qh8#

Anticipated by 185895(1971)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • P(d);OGATEB,SBLOCK,XP(B)::QAR(C)
  • Tries
    • Try
      • Q(C);
      • Threat
        • DUALS(2)
      • Vars
        • K(b);OGATEB,P-FLIGHT,XP(B)::QAR2(C)
        • B(a);XP(B)::QAB1(C)
        • P(d);OGATEB,SBLOCK,XP(B)::QAR(C)
      • Refutation
        • B(a);
    • Try
      • Q(C);
      • Threat
        • QAB1(C)
      • Vars
        • P(d);OGATEB,SBLOCK,XP(B)::QAR2(C)
      • Refutation
        • K(b);P-FLIGHT,XP(B)
    • Try
      • Q(C);
      • Threat
        • QAB1(C)
      • Vars
        • P(d);OGATEB,SBLOCK,XP(B)::QAR(C)
      • Refutation
        • K(b);P-FLIGHT,XP(B)
    • Try
      • Q(C);
      • Threat
        • QAR1(C),XP(d)
      • Vars
        • B(a);SBLOCK,XP(B)::QAB(C)
        • P(d);OGATEB,SBLOCK,XP(B)::QAR(C)
      • Refutation
        • K(b);P-FLIGHT,XP(B)
    • Try
      • Q(C);P_PINP(d)
      • Threat
        • QAR1(C),XP(d)
      • Vars
        • K(b);N_SPINP(d),OGATEB,P-FLIGHT,XP(B)::QAR2(C)
      • Refutation
        • B(a);XP(B)
  • Actual
    • Q(C);
    • Threat
      • QAR1(C),XP(d)
    • Vars
      • K(b);OGATEB,P-FLIGHT,XP(B)::QAR2(C)
      • B(a);SBLOCK,XP(B)::QAB(C)
      • P(d);OGATEB,SBLOCK,XP(B)::QAR(C)
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