MESON Chess Problem Database

Problem Display
PID: 62227 (4R2r/1Q2N2B/3q1Pp1/3pN1r1/1bP1k1p1/8/3P2K1/Bb3R2 w - - 0 1)

Ahues, Herbert Siegfried Oskar

1st Prize, Het Parool, 1979

4R2r/1Q2N2B/3q1Pp1/3pN1r1/1bP1k1p1/8/3P2K1/Bb3R2

#2

11 + 9

102 Probleemblad 1979
3750 FIDE Album (1977-1979) 1984

SOLUTION

  • SOUND
  • Sets
    • 1...Qc7
      • 2.Qxd5#
    • 1...Qxe7
      • 2.Qxd5#
    • 1...Qb8
      • 2.Qxd5#
    • 1...Qa6
      • 2.Qxd5#
    • 1...Qb6
      • 2.Qxd5#
    • 1...Qxf6
      • 2.Qxd5#
    • 1...Ba3
      • 2.Qxb1#
    • 1...Ba5
      • 2.Qxb1#
    • 1...Bc5
      • 2.Qxb1#
  • Tries
    • 1.S7xg6?
      • threat
        • 2.Rf4#
      • 1...Qxe5
        • 2.Qxd5#
      • 1...Qxf6
        • 2.Qxd5#
      • 1...Rxe5
        • 2.Sxh8#
      • 1...Rxg6
        • 2.Bxg6#
      • 1...Rf5
        • 2.Re1#
      • 1...Bxd2!
    • 1.Bxg6+?
      • 1...Rf5
        • 2.Bxf5#
      • 1...Rxg6!
  • Keys
    • 1.Sxd5!
      • threat
        • 2.Rf4#
      • 1...Qxe5
        • 2.Sxb4#
      • 1...Qxd5
        • 2.Qxd5#
      • 1...Qxf6
        • 2.Sxf6#
      • 1...Rxe5
        • 2.Bxg6#
      • 1...Bxd2
        • 2.Qxb1#
      • 1...Rf5
        • 2.Re1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 5
    • REMOVED MATES = 8
  • Sets
    • Q(g);N_GUARD::QAB1(H),XP(e)
    • Q(g);N_GUARD,XS(I)::QAB1(H),XP(e)
    • Q(g);N_GUARD,XP(G)::QAB1(H),XP(e)
    • B(b);OGATE::QAB(H),XB(a)
  • Tries
    • Try
      • S(I);XP(h)
      • Threat
        • R1(B)
      • Vars
        • Q(g);N_GUARD,P_SPINQ(g),XS(F)::QAB1(H),XP(e)
        • Q(g);N_GUARD,XP(G)::QAB1(H),XP(e)
        • R(f);N_GUARD,P_SPINR(f),XS(F)::B(J)+S(I),XR(i)
        • R(f);OGATE,P_SPINR(f),XS(I)::B(J),XR(f)
        • R(f);SBLOCK::R(B)
      • Refutation
        • B(b);XP(C)
    • Try
      • B(J);CHECK,XP(h)
      • Vars
        • R(f);N_GUARD,P_SPINR(f)::B(J),XR(f)
      • Refutation
        • R(f);XB(J)
  • Actual
    • S(I);P_PINP(h),XP(e)
    • Threat
      • R1(B)
    • Vars
      • Q(g);N_GUARD,P_SPINQ(g),XS(F)::QAB(H)+S(I),XB(b)
      • Q(g);OGATE,P_SPINQ(g),XS(I)::QAB1(H),XQ(g)
      • Q(g);XP(G)::QAB(H)+S(I),DCHECK,XQ(g)
      • R(f);N_GUARD,P_SPINR(f),XS(F)::B(J),XP(h)
      • B(b);OGATE,XP(C)::QAB(H),XB(a)
      • R(f);N_SPINP(h),SBLOCK::R(B)
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