MESON Chess Problem Database

Problem Display
PID: 82309 (2Qn4/1rn2b2/1p1P2r1/3kP1p1/R2P4/5PB1/N7/2RK2b1 w - - 0 1)

Ahues, Herbert Siegfried Oskar

Die Schwalbe, 1989

2Qn4/1rn2b2/1p1P2r1/3kP1p1/R2P4/5PB1/N7/2RK2b1

#2

10 + 9

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Bxd4
      • 2.Sb4#
    • 1...Sb5
      • 2.Qc4#
    • 1...Sa6
      • 2.Sc3#
      • 2.Qc4#
    • 1...Sce6
      • 2.Sc3#
      • 2.Qc4#
    • 1...Sa8
      • 2.Sc3#
      • 2.Qc4#
    • 1...Se8
      • 2.Sc3#
      • 2.Qc4#
    • 1...Sc6
      • 2.Sc3#
    • 1...Sde6
      • 2.Qxb7#
    • 1...b5
      • 2.Rc5#
  • Tries
    • 1.Bf2?
      • threat
        • 2.Sb4#
      • 1...Sa6
        • 2.Sc3#
        • 2.Qc4#
      • 1...Sc6
        • 2.Sc3#
      • 1...Bxf2!
    • 1.Rcc4?
      • threat
        • 2.Sc3#
      • 1...Sb5
        • 2.Sb4#
      • 1...Bxd4!
    • 1.Rxc7?
      • threat
        • 2.Sc3#
      • 1...Bxd4
        • 2.Sb4#
      • 1...Rxc7!
    • 1.Rac4?
      • threat
        • 2.Sb4#
      • 1...Sa6
        • 2.Sc3#
      • 1...Sc6!
    • 1.Qg4?
      • threat
        • 2.Sb4#
      • 1...Sc6
        • 2.Sc3#
      • 1...Sa6!
    • 1.Qd7?
      • threat
        • 2.Sc3#
      • 1...Bxd4
        • 2.Sb4#
      • 1...Sb5!
  • Keys
    • 1.Qf5!
      • threat
        • 2.e6#
      • 1...Bxd4
        • 2.Sb4#
      • 1...Re6
        • 2.Qe4#
      • 1...Rf6
        • 2.exf6#
      • 1...Be6
        • 2.Qe4#
      • 1...Sce6
        • 2.Qe4#
      • 1...Sc6
        • 2.Sc3#
      • 1...Sde6
        • 2.Qe4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 2
  • Sets
    • B(a);SBLOCK,XP(G)::S(C)
    • S(g);OGATE::QAB1(J)
    • S(i);SBLOCK::S(C)
    • S(i);N_GUARD,SBLOCK::QAB(J),XR(f)
    • P(d);N_GUARD::R1(A)
  • Tries
    • Try
      • B(E);
      • Threat
        • S(C)
      • Vars
        • S(i);SBLOCK::S(C)
      • Refutation
        • B(a);XB(E)
    • Try
      • R(A);
      • Threat
        • S(C)
      • Vars
        • S(g);::S(C)
      • Refutation
        • B(a);XP(G)
    • Try
      • R(A);XS(g)
      • Threat
        • S(C)
      • Vars
        • B(a);SBLOCK,XP(G)::S(C)
      • Refutation
        • R(f);XR(A)
    • Try
      • R(F);
      • Threat
        • S(C)
      • Vars
        • S(g);::S(C)
      • Refutation
        • S(i);
    • Try
      • Q(J);
      • Threat
        • S(C)
      • Vars
        • S(i);SBLOCK::S(C)
      • Refutation
        • S(g);
    • Try
      • Q(J);
      • Threat
        • S(C)
      • Vars
        • B(a);SBLOCK,XP(G)::S(C)
      • Refutation
        • S(g);
  • Actual
    • Q(J);
    • Threat
      • QAR(J)+P(H)
    • Vars
      • B(a);SBLOCK,XP(G)::S(C)
      • R(e);SBLOCK::QAB1(J)
      • R(e);OGATE::QAR(J)+P(H),XR(e)
      • B(h);SBLOCK::QAB1(J)
      • S(g);SBLOCK::QAB1(J)
      • S(i);SBLOCK::S(C)
      • S(i);SBLOCK::QAB1(J)
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