MESON Chess Problem Database

Problem Display
PID: 245700 (1BB2r2/1N1n2b1/2N1P1p1/1P1k1PQR/4p1R1/qP1p3K/8/8 w - - 0 1)

Wirtanen, Erkki Aukusti

Norsk Sjakkblad, 1958

1BB2r2/1N1n2b1/2N1P1p1/1P1k1PQR/4p1R1/qP1p3K/8/8

#2

12 + 8

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Sc5
      • 2.f6#
    • 1...Sb6
      • 2.f6#
    • 1...Sf6
      • 2.fxg6#
    • 1...Sxb8
      • 2.f6#
  • Tries
    • 1.Qf4?
      • threat
        • 2.Qxe4#
      • 1...Qa4
        • 2.Qd6#
      • 1...Sc5
        • 2.Qd6#
      • 1...Sf6
        • 2.Qe5#
      • 1...e3
        • 2.Qf3#
        • 2.Qc4#
        • 2.Qe4#
      • 1...Qb4!
    • 1.f6+?
      • 1...Se5
        • 2.Qxe5#
      • 1...Kxe6!
  • Keys
    • 1.Qe3!
      • threat
        • 2.Qxe4#
      • 1...Qb4
        • 2.Sxb4#
      • 1...Qa4
        • 2.Se7#
      • 1...Sc5
        • 2.Se7#
      • 1...Sf6
        • 2.Qd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • S(f);N_GUARD::QAR(F)+P(E)
    • S(f);N_GUARD,S_CUTB(g),S_CUTR(h)::QAR(F)+P(E),XP(e)
    • S(f);N_GUARD,XB(K)::QAR(F)+P(E)
  • Tries
    • Try
      • Q(F);
      • Threat
        • QAB1(F),XP(c)
      • Vars
        • Q(a);N_GUARD::QAR1(F)
        • S(f);S_CUTQ(a)::QAR1(F)
        • S(f);N_GUARD,S_CUTB(g)::QAR1(F)
      • Refutation
        • Q(a);
    • Try
      • P(E);CHECK
      • Vars
        • S(f);N_GUARD,P_SPINS(f)::QAR1(F),XS(f)
      • Refutation
        • K(d);P_SPINS(f),S_FLIGHT,XP(I)
  • Actual
    • Q(F);
    • Threat
      • QAB1(F),XP(c)
    • Vars
      • Q(a);N_GUARD::S(H),XQ(a)
      • Q(a);N_GUARD::S(H)
      • S(f);S_CUTQ(a)::S(H)
      • S(f);S_CUTB(g)::QAR1(F)
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Developed and maintained by Brian Stephenson.
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