MESON Chess Problem Database

Problem Display
PID: 162333 (8/2rp2n1/R1P2p2/2pk1P1p/2N5/K4n1r/B2NR1Q1/B7 w - - 0 1)

Ahues, Herbert Siegfried Oskar

stern, 1992

(First published on Thu Jan 16 1992)

8/2rp2n1/R1P2p2/2pk1P1p/2N5/K4n1r/B2NR1Q1/B7

#2

10 + 9

15148 Sadier Collection 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Rh1
      • 2.Qxf3#
    • 1...Rh2
      • 2.Qxf3#
    • 1...Sxf5
      • 2.Qg8#
    • 1...Se8
      • 2.Qg8#
    • 1...d6
      • 2.Se3#
  • Tries
    • 1.Se5+?
      • 1...Kd6
        • 2.Sf7#
      • 1...c4!
    • 1.Bb1?
      • threat
        • 2.Be4#
      • 1...Sxf5
        • 2.Qg8#
      • 1...Rh4!
    • 1.cxd7?
      • threat
        • 2.Se3#
        • 2.Rd6#
      • 1...Rxd7
        • 2.Se3#
      • 1...Sxf5
        • 2.Se3#
        • 2.Qg8#
      • 1...Ra7
        • 2.Se3#
      • 1...Se8
        • 2.Se3#
        • 2.Qg8#
      • 1...Rc6!
  • Keys
    • 1.Se4!
      • threat
        • 2.Sxf6#
      • 1...Se1+
        • 2.Se3#
      • 1...Sg1+
        • 2.Se3#
      • 1...Sd2+
        • 2.Se3#
      • 1...Sh2+
        • 2.Se3#
      • 1...Sd4+
        • 2.Sc3#
      • 1...Sh4+
        • 2.Se3#
      • 1...Se5+
        • 2.Se3#
      • 1...Sg5+
        • 2.Se3#
      • 1...Rxc6
        • 2.Sb6#
      • 1...Se8
        • 2.Qg8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 9
    • REMOVED MATES = 4
  • Sets
    • R(b);N_GUARD::QAB(E),XS(a)
    • S(i);OGATE,XP(H)::QAB(E)
    • S(i);OGATE::QAB(E)
    • P(h);SBLOCK::B(B)+S(G),DCHECK
  • Tries
    • Try
      • S(G);CHECK
      • Vars
        • K(d);N_SPINS(a),P-FLIGHT::S(G)
      • Refutation
        • P(c);P_SPINP(c)
    • Try
      • B(B);
      • Threat
        • B(B)
      • Vars
        • S(i);OGATE,XP(H)::QAB(E)
      • Refutation
        • R(b);
    • Try
      • P(J);XP(h)
      • Threat
        • DUALS(2)
      • Vars
        • R(g);XP(J)::B(B)+S(G),DCHECK
        • R(g);P_PINR(I)::B(B)+S(G),DCHECK
      • Refutation
        • R(g);
  • Actual
    • S(C);N_PINS(a)
    • Threat
      • S(C),XP(f)
    • Vars
      • S(a);CHECK::B(B)+S(G),DCHECK
      • S(a);CHECK,SBLOCK::QAB(E)+S(C),DCHECK
      • R(g);SBLOCK,XP(J)::B(B)+S(G),DCHECK
      • S(i);OGATE::QAB(E)
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