MESON Chess Problem Database

Problem Display
PID: 22166 (1nQ5/N7/PPP5/3p4/2kp4/2pN4/2K5/8 w - - 0 1)

Ojanen, Antti Gottfried

3rd Prize, Suomen Tehtavaniekat, 1965

1nQ5/N7/PPP5/3p4/2kp4/2pN4/2K5/8

#2

7 + 5

3772 FIDE Album (1965-1967) 1976

SOLUTION

  • SOUND
  • Sets
    • 1...Sxa6
      • 2.Qxa6#
    • 1...Sxc6
      • 2.Qxc6#
    • 1...Sd7
      • 2.cxd7#
  • Tries
    • 1.Qb7?
      • 1...Sxa6
        • 2.Qxa6#
      • 1...Sxc6
        • 2.Qxc6#
      • 1...Sd7!
    • 1.Qc7?
      • 1...Sxc6
        • 2.Qxc6#
      • 1...Sd7
        • 2.cxd7#
      • 1...Sxa6!
    • 1.b7?
      • 1...Sxc6
        • 2.Qxc6#
      • 1...Sd7
        • 2.cxd7#
      • 1...Sxa6!
  • Keys
    • 1.Qf8!
      • threat
        • 2.Se5#
        • 2.Qb4#
        • 2.Qc5#
      • 1...Sxa6
        • 2.Se5#
      • 1...Sxc6
        • 2.Qc5#
      • 1...Sd7
        • 2.Qb4#

FEATURES

  • Static
    • TYPE = BLOCK_THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • S(e);OGATE,XP(C)::QAB(G),XS(e)
    • S(e);OGATE,P_SPINS(e),XP(E)::QAR2(G),XS(e)
    • S(e);OGATE::QAR(G)+P(E),XS(e)
  • Tries
    • Try
      • Q(G);
      • Vars
        • S(e);OGATE,XP(C)::QAB(G),XS(e)
        • S(e);OGATE,XP(E)::QAR2(G),XS(e)
      • Refutation
        • S(e);
    • Try
      • Q(G);
      • Vars
        • S(e);OGATE,P_SPINS(e),XP(E)::QAR2(G),XS(e)
        • S(e);OGATE::QAR(G)+P(E),XS(e)
      • Refutation
        • S(e);XP(C)
    • Try
      • P(D);
      • Vars
        • S(e);OGATE,P_SPINS(e),XP(E)::QAR2(G),XS(e)
        • S(e);OGATE::QAR(G)+P(E),XS(e)
      • Refutation
        • S(e);XP(C)
  • Actual
    • Q(G);
    • Threat
      • DUALS(3)
    • Vars
      • S(e);XP(C)::S(B)
      • S(e);XP(E)::QAR1(G)
      • S(e);::QAR1(G)
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