MESON Chess Problem Database

Problem Display
PID: 202422 (8/5Q2/5N2/8/3p1kBB/3n4/8/6K1 w - - 0 1)

Neunivako, Pavel Efimovich

Source?, 1923

8/5Q2/5N2/8/3p1kBB/3n4/8/6K1

#2

5 + 3

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Ke5
      • 2.Qc7#
  • Tries
    • 1.Sd5+?
      • 1...Ke4
        • 2.Qf5#
      • 1...Ke5
        • 2.Qe6#
      • 1...Kxg4!
    • 1.Qd5?
      • threat
        • 2.Qe4#
        • 2.Qxd4#
        • 2.Qg5#
      • 1...Sf2
        • 2.Qg5#
      • 1...Sc5
        • 2.Qg5#
      • 1...Se5
        • 2.Qe4#
        • 2.Qxd4#
      • 1...Ke3!
    • 1.Qe6?
      • threat
        • 2.Sd5#
        • 2.Sh5#
        • 2.Qe4#
      • 1...Sf2
        • 2.Sd5#
        • 2.Sh5#
      • 1...Sb4
        • 2.Sh5#
        • 2.Qe4#
      • 1...Sc5
        • 2.Sd5#
        • 2.Sh5#
      • 1...Se5!
    • 1.Qg8?
      • threat
        • 2.Qg5#
      • 1...Ke5
        • 2.Qb8#
      • 1...Ke3!
    • 1.Qc7+?
      • 1...Se5
        • 2.Qc1#
      • 1...Ke3!
    • 1.Qg7?
      • threat
        • 2.Qg5#
      • 1...Ke5
        • 2.Qc7#
      • 1...Ke3!
  • Keys
    • 1.Qb3!
      • 1...Ke3
        • 2.Bg5#
      • 1...Ke5
        • 2.Qb8#
      • 1...Sc1
        • 2.Qg3#
      • 1...Se1
        • 2.Qg3#
      • 1...Sb2
        • 2.Qg3#
      • 1...Sf2
        • 2.Qg3#
      • 1...Sb4
        • 2.Qg3#
      • 1...Sc5
        • 2.Qg3#
      • 1...Se5
        • 2.Qg3#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 8
    • REMOVED MATES = 0
  • Sets
    • K(c);S_FLIGHT::QAB(E)
  • Tries
    • Try
      • S(D);CHECK
      • Vars
        • K(c);P-FLIGHT::QAB1(E)
        • K(c);S_FLIGHT::QAR1(E)
      • Refutation
        • K(c);P-FLIGHT,XB(B)
    • Try
      • Q(E);
      • Threat
        • DUALS(3)
      • Vars
        • S(a);::QAB1(E)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • Q(E);
      • Threat
        • DUALS(3)
      • Refutation
        • S(a);
    • Try
      • Q(E);
      • Threat
        • QAB1(E)
      • Vars
        • K(c);S_FLIGHT::QAB(E)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • Q(E);CHECK
      • Vars
        • S(a);N_GUARD,P_SPINS(a),SBLOCK::QAB(E)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • Q(E);
      • Threat
        • QAB1(E)
      • Vars
        • K(c);S_FLIGHT::QAB(E)
      • Refutation
        • K(c);S_FLIGHT
  • Actual
    • Q(E);
    • Vars
      • K(c);P_SPINS(a),S_FLIGHT::B(C)
      • K(c);S_FLIGHT::QAB(E)
      • S(a);OGATE::QAB1(E)
      • S(a);OGATE,SBLOCK::QAB1(E)
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