MESON Chess Problem Database

Problem Display
PID: 221922 (4b3/4P2n/2N2knB/Q5pp/4pr2/K3N3/B7/8 w - - 0 1)

Gedda, Bertil Einar

Stella Polaris, 1967

4b3/4P2n/2N2knB/Q5pp/4pr2/K3N3/B7/8

#2

7 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Rg4
      • 2.Qf5#
    • 1...Rh4
      • 2.Qf5#
    • 1...Rf5
      • 2.Qxf5#
    • 1...Sf8
      • 2.Qxg5#
  • Tries
    • 1.Qd5?
      • threat
        • 2.Qe6#
        • 2.Qd6#
      • 1...Bd7
        • 2.Qf7#
      • 1...Bf7
        • 2.Qxf7#
      • 1...Shf8
        • 2.Qxg5#
      • 1...Sgf8!
  • Keys
    • 1.Qd8!
      • threat
        • 2.Qd6#
      • 1...Sgf8
        • 2.exf8S#
      • 1...Bd7
        • 2.e8S#
      • 1...Bf7
        • 2.e8S#
      • 1...Shf8
        • 2.exf8Q#
        • 2.exf8R#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 4
  • Sets
    • R(b);N_GUARD::QAR1(D)
    • R(b);N_GUARD::QAR1(D),XR(b)
    • S(g);N_GUARD::QAB1(D),XP(c)
  • Tries
    • Try
      • Q(D);
      • Threat
        • DUALS(2)
      • Vars
        • B(h);N_GUARD::QAR1(D)
        • B(h);N_GUARD::QAR1(D),XB(h)
        • S(g);N_GUARD::QAB1(D),XP(c)
      • Refutation
        • S(f);
  • Actual
    • Q(D);
    • Threat
      • QAR2(D)
    • Vars
      • S(f);OGATE::PXS(f)=S
      • B(h);OGATE::P=S
      • S(g);OGATE::PXS(g)=Q
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