MESON Chess Problem Database

Problem Display
PID: 8083 (8/4n3/B5pn/3p1kN1/3Q3P/3p3r/1N3PRb/B2K4 w - - 0 1)

Lincoln, Robert A

3rd HM., Die Schwalbe, 1995

8/4n3/B5pn/3p1kN1/3Q3P/3p3r/1N3PRb/B2K4

#2

9 + 8

23 Die Schwalbe 2002
145 StrateGems 2003

SOLUTION

  • SOUND
  • Sets
    • 1...Bg3
      • 2.Bxd3#
    • 1...Sc6
      • 2.Bc8#
    • 1...Sc8
      • 2.Bxc8#
    • 1...Sg8
      • 2.Bc8#
  • Tries
    • 1.Sxd3?
      • threat
        • 2.Qf6#
      • 1...Rxd3+
        • 2.Bxd3#
      • 1...Be5
        • 2.Qxe5#
      • 1...Rg3
        • 2.Qf4#
      • 1...Sg4
        • 2.Qxg4#
      • 1...Shg8
        • 2.Qg4#
      • 1...Seg8
        • 2.Bc8#
      • 1...Bg3!
    • 1.Sa4?
      • threat
        • 2.Qf6#
      • 1...Be5
        • 2.Qxe5#
      • 1...Bg3
        • 2.Bxd3#
      • 1...Sg4
        • 2.Qxg4#
      • 1...Shg8
        • 2.Qg4#
      • 1...Seg8
        • 2.Bc8#
      • 1...Rg3!
  • Keys
    • 1.Sc4!
      • threat
        • 2.Qf6#
      • 1...Be5
        • 2.Qxe5#
      • 1...Rg3
        • 2.Sd6#
      • 1...Bg3
        • 2.Se3#
      • 1...Sg4
        • 2.Qxg4#
      • 1...Shg8
        • 2.Qg4#
      • 1...Seg8
        • 2.Bc8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 2
  • Sets
    • B(a);S_CUTR(c)::B(I),XP(b)
    • S(h);N_GUARD::B(I)
    • S(h);N_GUARD::B(I),XS(h)
  • Tries
    • Try
      • S(C);XP(b)
      • Threat
        • QAR1(F)
      • Vars
        • R(c);CHECK,OGATE,XS(C)::B(I),XR(c)
        • B(a);N_GUARD::QAR1(F),XB(a)
        • R(c);S_CUTB(a)::QAR1(F)
        • S(g);N_GUARD::QAB1(F),XS(g)
        • S(g);N_GUARD::QAB1(F)
        • S(h);N_GUARD::B(I)
      • Refutation
        • B(a);
    • Try
      • S(C);
      • Threat
        • QAR1(F)
      • Vars
        • B(a);N_GUARD::QAR1(F),XB(a)
        • B(a);S_CUTR(c)::B(I),XP(b)
        • S(g);N_GUARD::QAB1(F),XS(g)
        • S(g);N_GUARD::QAB1(F)
        • S(h);N_GUARD::B(I)
      • Refutation
        • R(c);
  • Actual
    • S(C);
    • Threat
      • QAR1(F)
    • Vars
      • B(a);N_GUARD::QAR1(F),XB(a)
      • R(c);S_CUTB(a)::S(C)
      • B(a);S_CUTR(c)::S(C)
      • S(g);N_GUARD::QAB1(F),XS(g)
      • S(g);N_GUARD::QAB1(F)
      • S(h);N_GUARD::B(I)
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