MESON Chess Problem Database

Problem Display
PID: 163727 (1nq1n3/8/5NK1/1NRPkp2/1p2p3/1B4p1/1b1Q4/1r6 w - - 0 1)

Ahues, Herbert Siegfried Oskar

stern, 1996

(First published on Thu Sep 19 1996)

1nq1n3/8/5NK1/1NRPkp2/1p2p3/1B4p1/1b1Q4/1r6

#2

7 + 10

15601 Albrecht-Leiss-Degener Collection 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Qa6
      • 2.d6#
    • 1...Qe6
      • 2.dxe6#
    • 1...Qd7
      • 2.d6#
    • 1...Qc6
      • 2.dxc6#
    • 1...Qd8
      • 2.d6#
    • 1...Sc6
      • 2.dxc6#
      • 2.d6#
    • 1...e3
      • 2.Qxe3#
  • Tries
    • 1.Kg5?
      • threat
        • 2.Qf4#
      • 1...Rf1
        • 2.Qxb2#
      • 1...e3
        • 2.Qxe3#
      • 1...f4
        • 2.Qxf4#
      • 1...Bc1!
    • 1.Sd7+?
      • 1...Qxd7
        • 2.d6#
      • 1...Sxd7!
    • 1.Qg5?
      • threat
        • 2.Sg4#
      • 1...Qa6
        • 2.Qxf5#
        • 2.d6#
      • 1...Qe6
        • 2.dxe6#
      • 1...Qc6
        • 2.Qxf5#
        • 2.dxc6#
      • 1...e3
        • 2.Qxe3#
      • 1...Sxf6!
  • Keys
    • 1.Sh5!
      • threat
        • 2.Qf4#
      • 1...Qa6+
        • 2.d6#
      • 1...Qe6+
        • 2.dxe6#
      • 1...Qc6+
        • 2.dxc6#
      • 1...e3
        • 2.Qxe3#
      • 1...Rf1
        • 2.Qxb2#
      • 1...Bc1
        • 2.Qd4#
      • 1...f4
        • 2.Qxf4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • Q(i);N_GUARD,P_PINS(F)::R(D)+P(E)
    • Q(i);OGATE,P_PINS(F)::R(D)+P(E),XQ(i)
    • Q(i);N_GUARD::R(D)+P(E)
    • P(e);OGATEB::QAR2(A),XP(e)
  • Tries
    • Try
      • K(G);P-FLIGHT
      • Threat
        • QAB1(A)
      • Vars
        • R(a);N_GUARD::QAB(A),XB(b)
        • P(e);OGATEB::QAR2(A),XP(e)
        • P(g);::QAB1(A),XP(g)
      • Refutation
        • B(b);P_PINQ(A)
    • Try
      • S(F);CHECK
      • Vars
        • Q(i);XS(F)::R(D)+P(E)
      • Refutation
        • S(h);XS(F)
    • Try
      • Q(A);P_PINP(g)
      • Threat
        • S(F)
      • Vars
        • Q(i);OGATE,P_PINS(F)::R(D)+P(E),XQ(i)
        • P(e);OGATEB::QAR2(A),XP(e)
      • Refutation
        • S(j);XS(F)
  • Actual
    • S(F);
    • Threat
      • QAB1(A)
    • Vars
      • Q(i);CHECK,N_GUARD::R(D)+P(E)
      • Q(i);CHECK,OGATE::R(D)+P(E),XQ(i)
      • P(e);OGATEB::QAR2(A),XP(e)
      • R(a);N_GUARD::QAB(A),XB(b)
      • B(b);N_GUARD::QAB1(A)
      • P(g);::QAB1(A),XP(g)
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