MESON Chess Problem Database

Problem Display
PID: 226362 (3B4/3PQ1NK/B1knPR1p/3p3r/P6r/3N4/2q5/1bR5 w - - 0 1)

Subrahmanyam, Swaminatha

British Chess Magazine, 1931

3B4/3PQ1NK/B1knPR1p/3p3r/P6r/3N4/2q5/1bR5

#2

11 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Qc5
      • 2.Rxc5#
    • 1...Sc4
      • 2.Qc5#
    • 1...Se4
      • 2.Sb4#
    • 1...Sb5
      • 2.axb5#
    • 1...Sf5
      • 2.Se5#
    • 1...Sb7
      • 2.Bb5#
    • 1...Sf7
      • 2.exf7#
    • 1...Sc8
      • 2.dxc8Q#
      • 2.dxc8R#
    • 1...Se8
      • 2.dxe8Q#
      • 2.dxe8B#
  • Tries
    • 1.Sf5?
      • threat
        • 2.Qxd6#
      • 1...Sxf5
        • 2.Se5#
      • 1...Sc4
        • 2.Sb4#
        • 2.Qc5#
      • 1...Se4
        • 2.Sb4#
        • 2.Se5#
        • 2.Sd4#
      • 1...Sb5
        • 2.Se5#
        • 2.axb5#
      • 1...Sb7
        • 2.Se5#
        • 2.Bb5#
      • 1...Sf7
        • 2.exf7#
      • 1...Sc8
        • 2.Se5#
        • 2.dxc8Q#
        • 2.dxc8R#
      • 1...Se8
        • 2.Se5#
        • 2.dxe8Q#
        • 2.dxe8B#
      • 1...Rxf5!
    • 1.Ba5?
      • threat
        • 2.d8S#
      • 1...Sb7
        • 2.Bb5#
      • 1...Sf7
        • 2.exf7#
      • 1...d4!
  • Keys
    • 1.Se8!
      • threat
        • 2.Qxd6#
      • 1...Sxe8
        • 2.dxe8Q#
        • 2.dxe8B#
      • 1...Sc4
        • 2.Qc5#
      • 1...Se4
        • 2.Sb4#
      • 1...Sb5
        • 2.axb5#
      • 1...Sf5
        • 2.Se5#
      • 1...Sb7
        • 2.Bb5#
      • 1...Sf7
        • 2.exf7#
      • 1...Sc8
        • 2.dxc8Q#
        • 2.dxc8R#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 1
  • Sets
    • Q(b);OGATE::R1(A),XQ(b)
    • S(g);N_SPINQ(b),OGATE::QAR1(H)
    • S(g);N_PINS(B)::S(B)
    • S(g);OGATE::P(C),XS(g)
    • S(g);N_GUARD,SBLOCK::B(D)
    • S(g);OGATE::R(F)+P(E),XS(g)
    • S(g);OGATE::PXS(g)=Q
  • Tries
    • Try
      • S(I);N_SPINS(B)
      • Threat
        • QAR1(H),XS(g)
      • Vars
        • S(g);XS(I)::S(B)
        • S(g);OGATE::R(F)+P(E),XS(g)
      • Refutation
        • R(e);XS(I)
    • Try
      • B(K);
      • Threat
        • P=S
      • Vars
        • S(g);N_GUARD,SBLOCK::B(D)
        • S(g);OGATE::R(F)+P(E),XS(g)
      • Refutation
        • P(d);
  • Actual
    • S(I);
    • Threat
      • QAR1(H),XS(g)
    • Vars
      • S(g);OGATE,XS(I)::PXS(g)=Q
      • S(g);N_SPINQ(b),OGATE::QAR1(H)
      • S(g);N_PINS(B)::S(B)
      • S(g);OGATE::P(C),XS(g)
      • S(g);N_GUARD,SBLOCK::B(D)
      • S(g);OGATE::R(F)+P(E),XS(g)
      • S(g);OGATE::PXS(g)=Q
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