MESON Chess Problem Database

Problem Display
PID: 82325 (4R3/r3N1r1/2PPBp1q/2B1kP1n/8/p1K1pQ2/8/1b6 w - - 0 1)

Ahues, Herbert Siegfried Oskar

Schweizer Schach-Magazin, 1990

4R3/r3N1r1/2PPBp1q/2B1kP1n/8/p1K1pQ2/8/1b6

#2

9 + 9

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qf4
      • 2.Qd5#
    • 1...Bxf5
      • 2.Qxf5#
  • Tries
    • 1.Sg6+?
      • 1...Rxg6
        • 2.Bd7#
      • 1...Qxg6!
    • 1.Bd7?
      • threat
        • 2.Sg6#
      • 1...Rxe7
        • 2.Rxe7#
      • 1...Qg6
        • 2.Sxg6#
      • 1...Rg6
        • 2.Sd5#
        • 2.Sxg6#
        • 2.Sc8#
        • 2.Sg8#
      • 1...Be4!
    • 1.Bf7?
      • threat
        • 2.Sg6#
      • 1...Rxe7
        • 2.Rxe7#
      • 1...Qf4
        • 2.Qd5#
      • 1...Qg6
        • 2.Sxg6#
      • 1...Rg6
        • 2.Sxg6#
      • 1...Sf4!
  • Keys
    • 1.Sc8!
      • threat
        • 2.Bd4#
      • 1...Qf4
        • 2.Qd5#
      • 1...Ra4
        • 2.Bf7#
      • 1...Rg4
        • 2.Bd7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • Q(g);SBLOCK::QAR1(B)
    • B(a);OGATE,XP(D)::QAR1(B),XB(a)
  • Tries
    • Try
      • S(H);CHECK
      • Vars
        • R(i);XS(H)::R(I)+B(G)
      • Refutation
        • Q(g);XS(H)
    • Try
      • B(G);
      • Threat
        • R(I)+S(H),DCHECK
      • Vars
        • R(i);OGATE,P_SPINR(i),XS(H)::R(I),XR(i)
        • Q(g);::R(I)+S(H),DCHECK,XQ(g)
      • Refutation
        • B(a);
    • Try
      • B(G);
      • Threat
        • R(I)+S(H),DCHECK
      • Vars
        • R(h);OGATE,P_SPINR(h),XS(H)::R(I),XR(h)
        • Q(g);SBLOCK::QAR1(B)
        • Q(g);::R(I)+S(H),DCHECK,XQ(g)
        • R(i);::R(I)+S(H),DCHECK,XR(i)
      • Refutation
        • S(e);
  • Actual
    • S(H);
    • Threat
      • B(C)
    • Vars
      • Q(g);SBLOCK::QAR1(B)
      • R(h);N_GUARD::R(I)+B(G)
      • R(i);N_GUARD::R(I)+B(G)
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