MESON Chess Problem Database

Problem Display
PID: 156521 (5Q1K/7p/4pn1r/1p2N1N1/p2kPB2/r7/bPB1pn2/2R1bq2 w - - 0 1)

Ahues, Herbert Siegfried Oskar

Norsk Sjakkblad, 1951

5Q1K/7p/4pn1r/1p2N1N1/p2kPB2/r7/bPB1pn2/2R1bq2

#2

9 + 13

15148 Sadier Collection 2016

SOLUTION

  • SOUND
  • Sets
    • 1...Rb3
      • 2.Sxe6#
    • 1...Rf3
      • 2.Sgxf3#
    • 1...Bc3
      • 2.Sgf3#
    • 1...Bb1
      • 2.Sxe6#
    • 1...Bb3
      • 2.Sgf3#
    • 1...Bc4
      • 2.Sc6#
  • Tries
    • 1.Qb4+?
      • 1...Bc4
        • 2.Sc6#
        • 2.Sxe6#
      • 1...Bxb4!
    • 1.Qd6+?
      • 1...Bd5
        • 2.Sxe6#
        • 2.Qb6#
      • 1...Sd5!
  • Keys
    • 1.Bb3!
      • threat
        • 2.Qc5#
      • 1...S2xe4
        • 2.Sxe6#
      • 1...S6xe4
        • 2.Sgf3#
      • 1...Bc3
        • 2.bxc3#
      • 1...Bb4
        • 2.Qxb4#
      • 1...Sd3
        • 2.Sc6#
      • 1...Sd7
        • 2.Qd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 5
    • REMOVED MATES = 5
  • Sets
    • R(f);S_CUTB(c)::S(G),XP(j)
    • R(f);N_GUARD::S(G),XR(f)
    • B(a);S_CUTR(f)::S(G)
    • B(c);N_GUARD::S(G),XP(j)
    • B(c);S_CUTR(f)::S(G)
    • B(c);SBLOCK::S(F)
  • Tries
    • Try
      • Q(H);CHECK
      • Refutation
        • B(a);XQ(H)
    • Try
      • Q(H);CHECK
      • Refutation
        • S(k);P_SPINS(k)
  • Actual
    • B(C);
    • Threat
      • QAB1(H)
    • Vars
      • S(e);SBLOCK,XP(D)::S(G),XP(j)
      • S(k);SBLOCK,XP(D)::S(G)
      • B(a);OGATE::P(B),XB(a)
      • B(a);N_GUARD::QAR2(H),XB(a)
      • S(e);SBLOCK::S(F)
      • S(k);N_GUARD::QAR2(H)
HTML5 logo

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).