MESON Chess Problem Database

Problem Display
PID: 272959 (b3N3/4p2B/2n1p3/4k2N/K1Q1P3/p2p2P1/1qn5/BR1r2b1 w - - 0 1)

Ahues, Herbert Siegfried Oskar

Schweizerische Schachzeitung, 2023

b3N3/4p2B/2n1p3/4k2N/K1Q1P3/p2p2P1/1qn5/BR1r2b1

#2

9 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Qd4
      • 2.Rb5#
    • 1...Bh2
      • 2.Qc5#
    • 1...Bc5
      • 2.Qxc5#
    • 1...S2d4
      • 2.Qc5#
    • 1...S6d4
      • 2.Qc7#
  • Tries
    • 1.Shf6?
      • threat
        • 2.Sg4#
        • 2.Sd7#
      • 1...Se3
        • 2.Sd7#
      • 1...Sb8
        • 2.Sg4#
      • 1...exf6!
    • 1.Bxb2+?
      • 1...Bd4
        • 2.Qb5#
        • 2.Qc5#
      • 1...S2d4
        • 2.Qb5#
        • 2.Qc5#
      • 1...S6d4
        • 2.Qc7#
      • 1...axb2!
    • 1.Qb5+?
      • 1...Bc5
        • 2.Qxc5#
      • 1...Kd4!
  • Keys
    • 1.Sf4!
      • threat
        • 2.Sg6#
      • 1...Qd4
        • 2.Rb5#
      • 1...Bd4
        • 2.Qxe6#
      • 1...S2d4
        • 2.Qc5#
      • 1...S6d4
        • 2.Qc7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 2
  • Sets
    • Q(c);OGATE,P_PINQ(E)::R(B)
    • B(b);N_GUARD::QAR2(E)
    • B(b);N_GUARD::QAR2(E),XB(b)
    • S(d);N_SPINQ(c),S_CUTB(b)::QAR2(E)
    • S(h);N_SPINQ(c),OGATE,SBLOCK::QAB(E)
  • Tries
    • Try
      • S(G);
      • Threat
        • DUALS(2)
      • Vars
        • S(d);::S(G)
        • S(h);::S(G)
      • Refutation
        • P(j);XS(G)
    • Try
      • B(A);CHECK,XQ(c)
      • Vars
        • S(h);OGATE,P_SPINS(h)::QAB(E)
      • Refutation
        • P(e);XB(A)
    • Try
      • Q(E);CHECK
      • Vars
        • B(b);N_GUARD,P_SPINB(b)::QAR2(E),XB(b)
      • Refutation
        • K(g);S_FLIGHT
  • Actual
    • S(G);
    • Threat
      • S(G)
    • Vars
      • Q(c);OGATE,P_PINQ(E)::R(B)
      • B(b);N_SPINQ(c),SBLOCK::QAR1(E),XP(i)
      • S(d);N_SPINQ(c),S_CUTB(b)::QAR2(E)
      • S(h);N_SPINQ(c),OGATE,SBLOCK::QAB(E)
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Developed and maintained by Brian Stephenson.
Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).