MESON Chess Problem Database

Problem Display
PID: 203541 (8/4N1Kp/4p3/2P1k1P1/2Q5/1r4Pb/8/1nbN4 w - - 0 1)

Stemmer, A

Essener Arbeiter Schachzeitung, 1924

8/4N1Kp/4p3/2P1k1P1/2Q5/1r4Pb/8/1nbN4

#2

7 + 7

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Re3
      • 2.Qf4#
    • 1...Bb2
      • 2.Qf4#
    • 1...Ba3
      • 2.Qf4#
    • 1...Bf4
      • 2.Qxf4#
      • 2.gxf4#
    • 1...Bf5
      • 2.Sc6#
    • 1...Sd2
      • 2.Qf4#
  • Tries
    • 1.Se3?
      • threat
        • 2.Sc6#
        • 2.Qf4#
      • 1...Rxe3
        • 2.Qf4#
      • 1...Rb4
        • 2.Sc6#
      • 1...Rb6
        • 2.Qf4#
      • 1...Rb7
        • 2.Qf4#
      • 1...Bg2
        • 2.Sg4#
        • 2.Qf4#
      • 1...Bxe3!
  • Keys
    • 1.Sf2!
      • threat
        • 2.Qe4#
      • 1...Re3
        • 2.Qf4#
      • 1...Rb4
        • 2.Sd3#
      • 1...Bg2
        • 2.Sg4#
      • 1...Bf5
        • 2.Sc6#
      • 1...Sd2
        • 2.Qf4#
      • 1...Sc3
        • 2.Sd3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • R(c);S_CUTB(b)::QAB1(C)
    • B(b);N_GUARD::QAB1(C)
    • B(d);SBLOCK::S(F)
    • S(a);S_CUTB(b)::QAB1(C)
  • Tries
    • Try
      • S(A);
      • Threat
        • DUALS(2)
      • Vars
        • R(c);XS(A)::QAB1(C)
        • R(c);::S(F)
        • R(c);::QAB1(C)
        • R(c);P_PINS(F)::QAB1(C)
      • Refutation
        • B(b);XS(A)
  • Actual
    • S(A);
    • Threat
      • QAR1(C)
    • Vars
      • R(c);S_CUTB(b)::QAB1(C)
      • R(c);N_GUARD::S(A)
      • B(d);N_GUARD::S(A)
      • B(d);SBLOCK::S(F)
      • S(a);S_CUTB(b)::QAB1(C)
      • S(a);S_CUTR(c)::S(A)
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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).