MESON Chess Problem Database

Problem Display
PID: 161668 (3N4/1r1p1r2/3p2Rq/N1PkP1P1/7p/1p1bQP1B/3K4/8 w - - 0 1)

Ahues, Herbert Siegfried Oskar

2nd Prize, Schweizerische Schachzeitung, 1980

3N4/1r1p1r2/3p2Rq/N1PkP1P1/7p/1p1bQP1B/3K4/8

#2

10 + 9

15148 Sadier Collection 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Qxg5
      • 2.Rxd6#
    • 1...Qg7
      • 2.Rxd6#
    • 1...Qh5
      • 2.Rxd6#
    • 1...Qh7
      • 2.Rxd6#
    • 1...Qh8
      • 2.Rxd6#
  • Tries
    • 1.Se6?
      • threat
        • 2.Qd4#
      • 1...dxc5
        • 2.Qxc5#
      • 1...dxe5
        • 2.Qxd3#
      • 1...dxe6
        • 2.Bxe6#
      • 1...Rb4
        • 2.Sc7#
      • 1...Rf4
        • 2.Sxf4#
      • 1...Qxg5!
    • 1.Qxd3+?
      • 1...Kxe5
        • 2.Qe4#
        • 2.Qxd6#
      • 1...Kxc5!
  • Keys
    • 1.Sdc6!
      • threat
        • 2.Qd4#
      • 1...Qxg5
        • 2.Rxd6#
      • 1...dxc5
        • 2.Qxd3#
      • 1...dxe5
        • 2.Qxe5#
      • 1...dxc6
        • 2.Be6#
      • 1...Rb4
        • 2.Sxb4#
      • 1...Rf4
        • 2.Se7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 4
  • Sets
    • Q(f);N_GUARD,P_PINQ(B),XP(H)::R1(I),XP(e)
    • Q(f);N_GUARD::R1(I),XP(e)
  • Tries
    • Try
      • S(J);
      • Threat
        • QAR1(B)
      • Vars
        • P(e);OGATE,XP(F)::QAR1(B),XP(e)
        • P(e);SBLOCK,XP(G)::QAR2(B),XB(b)
        • P(h);OGATE,XS(J)::B(D),XP(h)
        • R(g);N_GUARD::S(J)
        • R(i);N_GUARD::S(J),XR(i)
      • Refutation
        • Q(f);P_PINQ(B),XP(H)
    • Try
      • Q(B);CHECK,P_SPINP(H),XB(b)
      • Refutation
        • K(d);P-FLIGHT,XP(F)
  • Actual
    • S(J);
    • Threat
      • QAR1(B)
    • Vars
      • Q(f);N_GUARD,P_PINQ(B),XP(H)::R1(I),XP(e)
      • P(e);SBLOCK,XP(F)::QAR2(B),XB(b)
      • P(e);OGATE,XP(G)::QAR1(B),XP(e)
      • P(h);N_GUARD,XS(J)::B(D)
      • R(g);N_GUARD::S(J),XR(g)
      • R(i);N_GUARD::S(J)
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