MESON Chess Problem Database

Problem Display
PID: 276914 (8/2KnpP2/1p2k1P1/2p1Pb2/3Pp3/1NN1Q3/8/8 w - - 0 1)

Wirtanen, Erkki Aukusti

Stella Polaris, 1971

8/2KnpP2/1p2k1P1/2p1Pb2/3Pp3/1NN1Q3/8/8

#2

8 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Bh3
      • 2.Qxh3#
    • 1...Sf6
      • 2.f8S#
    • 1...Sb8
      • 2.f8S#
  • Tries
    • 1.Sxc5+?
      • 1...Sxc5
        • 2.f8S#
      • 1...bxc5!
    • 1.Qg3?
      • threat
        • 2.d5#
      • 1...Sxe5
        • 2.Qxe5#
      • 1...cxd4
        • 2.Sxd4#
      • 1...Bh3
        • 2.Qxh3#
      • 1...Bg4
        • 2.Qxg4#
      • 1...Sf6
        • 2.f8S#
      • 1...Bxg6!
  • Keys
    • 1.Qf4!
      • threat
        • 2.d5#
      • 1...Sxe5
        • 2.Qxe5#
      • 1...cxd4
        • 2.Sxd4#
      • 1...Sf6
        • 2.f8S#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • B(c);OGATEB::QAB(C),XB(c)
    • S(f);N_GUARD::P=S
  • Tries
    • Try
      • S(A);CHECK,XP(b)
      • Vars
        • S(f);N_GUARD,S_CUTP(d),XS(A)::P=S
      • Refutation
        • P(d);XS(A)
    • Try
      • Q(C);
      • Threat
        • P(D)
      • Vars
        • S(f);OGATE,XP(E)::QAR1(C),XS(f)
        • P(b);XP(D)::S(A),XP(b)
        • B(c);OGATEB::QAB(C),XB(c)
        • S(f);N_GUARD::P=S
      • Refutation
        • B(c);XP(F)
  • Actual
    • Q(C);
    • Threat
      • P(D)
    • Vars
      • S(f);OGATE,XP(E)::QAR1(C),XS(f)
      • P(b);XP(D)::S(A),XP(b)
      • S(f);N_GUARD::P=S
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