MESON Chess Problem Database

Problem Display
PID: 82313 (8/2qB3b/1R2P1pK/p1PkP3/7Q/1N3N2/2n5/8 w - - 0 1)

Ahues, Herbert Siegfried Oskar

US Problem Bulletin, 1989

8/2qB3b/1R2P1pK/p1PkP3/7Q/1N3N2/2n5/8

#2

9 + 6

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qd6
      • 2.Rxd6#
    • 1...Qd8
      • 2.Rd6#
    • 1...Qa7
      • 2.Rd6#
    • 1...Qb7
      • 2.Rd6#
    • 1...Qc8
      • 2.Rd6#
    • 1...Sa1
      • 2.Qd4#
    • 1...Se1
      • 2.Qd4#
    • 1...Sa3
      • 2.Qd4#
    • 1...Se3
      • 2.Qd4#
    • 1...Sb4
      • 2.Qd4#
    • 1...Sd4
      • 2.Qxd4#
  • Tries
    • 1.Sxa5?
      • threat
        • 2.Qc4#
      • 1...Kxc5
        • 2.Rb5#
      • 1...Sa3
        • 2.Qd4#
      • 1...Se3
        • 2.Qd4#
      • 1...Sd4
        • 2.Qxd4#
      • 1...Qxc5!
    • 1.Sfd2?
      • threat
        • 2.Qe4#
      • 1...Kxe5
        • 2.Qg5#
      • 1...Qxe5
        • 2.Qc4#
      • 1...g5!
    • 1.Sg5?
      • threat
        • 2.Qe4#
      • 1...Qxe5
        • 2.Bc6#
      • 1...Sd4
        • 2.Qxd4#
      • 1...Kxe5!
    • 1.Bc6+?
      • 1...Kxe6
        • 2.Qf6#
      • 1...Qxc6!
  • Keys
    • 1.Sbd2!
      • threat
        • 2.Qc4#
      • 1...Kxc5
        • 2.Rb5#
      • 1...Qxc5
        • 2.Qe4#
      • 1...Sa3
        • 2.Qd4#
      • 1...Se3
        • 2.Qd4#
      • 1...Sd4
        • 2.Qxd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 8
  • Sets
    • Q(e);N_GUARD::R1(F),XQ(e)
    • Q(e);N_GUARD::R1(F)
    • S(a);N_GUARD::QAR1(C)
    • S(a);N_GUARD::QAR1(C),XS(a)
  • Tries
    • Try
      • S(A);XP(b)
      • Threat
        • QAB1(C)
      • Vars
        • K(c);OGATEB,P-FLIGHT,XP(D)::R1(F)
        • S(a);N_GUARD::QAR1(C)
        • S(a);N_GUARD::QAR1(C),XS(a)
      • Refutation
        • Q(e);XP(D)
    • Try
      • S(B);
      • Threat
        • QAB1(C)
      • Vars
        • K(c);OGATEB,P-FLIGHT,XP(E)::QAR2(C)
        • Q(e);SBLOCK,XP(E)::QAB1(C)
      • Refutation
        • P(d);
    • Try
      • S(B);
      • Threat
        • QAB1(C)
      • Vars
        • Q(e);N_GUARD,SBLOCK,XP(E)::B(I)
        • S(a);N_GUARD::QAR1(C),XS(a)
      • Refutation
        • K(c);P-FLIGHT,XP(E)
    • Try
      • B(I);CHECK
      • Vars
        • K(c);S_FLIGHT,XP(G)::QAR1(C)
      • Refutation
        • Q(e);XB(I)
  • Actual
    • S(A);
    • Threat
      • QAB1(C)
    • Vars
      • K(c);OGATEB,P-FLIGHT,XP(D)::R1(F)
      • Q(e);SBLOCK,XP(D)::QAB1(C)
      • S(a);N_GUARD::QAR1(C)
      • S(a);N_GUARD::QAR1(C),XS(a)
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