MESON Chess Problem Database

Problem Display
PID: 81975 (2b2B1b/2R2n2/3p2N1/8/2pk2p1/5Br1/3P1N1Q/K3R3 w - - 0 1)

Ahues, Herbert Siegfried Oskar

Canadian Chess Chat, 1980

2b2B1b/2R2n2/3p2N1/8/2pk2p1/5Br1/3P1N1Q/K3R3

#2

9 + 8

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Rg1
      • 2.Qf4#
    • 1...Rg2
      • 2.Qf4#
    • 1...Rh3
      • 2.Qf4#
    • 1...Sg5
      • 2.Qxh8#
    • 1...Sd8
      • 2.Qxh8#
    • 1...c3
      • 2.dxc3#
    • 1...d5
      • 2.Bc5#
  • Tries
    • 1.Sf4?
      • threat
        • 2.Re4#
      • 1...Rg1
        • 2.Se2#
      • 1...Bb7
        • 2.Se6#
      • 1...Sg5
        • 2.Qxh8#
      • 1...d5
        • 2.Bc5#
      • 1...Bf5!
    • 1.Qxh8+?
      • 1...Sxh8
        • 2.Bg7#
      • 1...Se5!
  • Keys
    • 1.Se7!
      • threat
        • 2.Re4#
      • 1...Rg1
        • 2.Qf4#
      • 1...Bf5
        • 2.Sxf5#
      • 1...Bb7
        • 2.Sf5#
      • 1...Sg5
        • 2.Qxh8#
      • 1...d5
        • 2.Sc6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 4
  • Sets
    • R(a);OGATE,P_PINR(B)::QAR2(E)
    • R(a);OGATE::QAR2(E)
    • S(f);N_GUARD::QAB(E),XB(h)
    • P(b);OGATE::P(C),XP(b)
    • P(e);OGATE::B(I)
  • Tries
    • Try
      • S(G);
      • Threat
        • R1(B)
      • Vars
        • R(a);P_PINR(B)::S(G)
        • B(g);N_GUARD::S(G)
        • S(f);N_GUARD::QAB(E),XB(h)
        • P(e);OGATE::B(I)
      • Refutation
        • B(g);
    • Try
      • Q(E);CHECK,XB(h)
      • Vars
        • S(f);N_GUARD,XQ(E)::B(I)
      • Refutation
        • S(f);P_SPINS(f)
  • Actual
    • S(G);
    • Threat
      • R1(B)
    • Vars
      • R(a);OGATE,P_PINR(B)::QAR2(E)
      • B(g);N_GUARD::S(G),XB(g)
      • B(g);N_GUARD::S(G)
      • S(f);N_GUARD::QAB(E),XB(h)
      • P(e);::S(G)
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