MESON Chess Problem Database

Problem Display
PID: 257500 (1B2NK2/5p2/2P1k3/1P3n2/3p4/1P2pQ2/8/bq3b2 w - - 0 1)

Osswald, Alfred H

Wiener Schachzeitung, 1935

1B2NK2/5p2/2P1k3/1P3n2/3p4/1P2pQ2/8/bq3b2

#2

7 + 8

15601 Albrecht-Leiss-Degener Collection 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Qa2
      • 2.Qe4#
    • 1...Qe4
      • 2.Qxe4#
    • 1...Qc1
      • 2.Qe4#
    • 1...Qd1
      • 2.Qe4#
    • 1...Qe1
      • 2.Qe4#
    • 1...Qb2
      • 2.Qe4#
    • 1...Qxb3
      • 2.Qe4#
    • 1...Sg3
      • 2.Sg7#
      • 2.Qxf7#
    • 1...Sh4
      • 2.Sg7#
      • 2.Qxf7#
    • 1...Sh6
      • 2.Sg7#
    • 1...Se7
      • 2.Sg7#
      • 2.Qxf7#
    • 1...Sg7
      • 2.Sxg7#
      • 2.Qxf7#
  • Tries
    • 1.Sg7+?
      • 1...Sxg7
        • 2.Qxf7#
      • 1...Kf6!
  • Keys
    • 1.Qf4!
      • threat
        • 2.Qe5#
      • 1...Kd5
        • 2.Qe5#
      • 1...Qe4
        • 2.Qxe4#
      • 1...Sd6
        • 2.Sc7#
      • 1...d3
        • 2.Qc4#
      • 1...f6
        • 2.Sc7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 7
  • Sets
    • Q(b);N_GUARD::QAR2(B)
    • Q(b);N_GUARD::QAR2(B),XQ(b)
    • Q(b);N_GUARD,XP(A)::QAR2(B)
    • S(f);N_GUARD::S(F)
  • Tries
    • Try
      • S(F);CHECK
      • Vars
        • S(f);OGATE,XS(F)::QAB1(B),XP(h)
      • Refutation
        • K(g);P-FLIGHT,P_SPINS(f)
  • Actual
    • Q(B);
    • Threat
      • QAR1(B)
    • Vars
      • K(g);S_FLIGHT::QAR1(B)
      • Q(b);N_GUARD::QAR2(B),XQ(b)
      • S(f);::S(F)
      • P(e);OGATE::QAB(B)
      • P(h);SBLOCK::S(F)
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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).