MESON Chess Problem Database

Problem Display
PID: 86023 (8/5R2/7p/3R3K/4N1p1/Qn2k3/8/8 w - - 0 1)

Speckmann, Werner

Schach-Echo, 1961

8/5R2/7p/3R3K/4N1p1/Qn2k3/8/8

#2

5 + 4

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Tries
    • 1.Sc3?
      • threat
        • 2.Qe7#
      • 1...Sd2
        • 2.Qc5#
        • 2.Qa7#
      • 1...Sc5
        • 2.Qc1#
        • 2.Qxc5#
      • 1...Sd4!
    • 1.Rd2?
      • 1...Kxe4
        • 2.Qe7#
      • 1...g3!
    • 1.Qe7?
      • threat
        • 2.Sd2#
        • 2.Sf2#
        • 2.Sc3#
        • 2.Sg3#
        • 2.Sc5#
        • 2.Sg5#
        • 2.Sd6#
      • 1...Ke2
        • 2.Sc3#
        • 2.Sg3#
        • 2.Sc5#
        • 2.Sg5#
        • 2.Sd6#
      • 1...g3
        • 2.Sd2#
        • 2.Sf2#
        • 2.Sc3#
        • 2.Sxg3#
        • 2.Sc5#
        • 2.Sg5#
        • 2.Sd6#
      • 1...Sd2
        • 2.Sxd2#
      • 1...Sc5
        • 2.Sxc5#
      • 1...Sd4!
    • 1.Qxb3+?
      • 1...Kxe4
        • 2.Qd3#
      • 1...Ke2!
  • Keys
    • 1.Sg5!
      • threat
        • 2.Qe7#
      • 1...Ke2
        • 2.Qe7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(B);N_PINS(a)
      • Threat
        • QAR(A)
      • Refutation
        • S(a);
    • Try
      • R(C);
      • Vars
        • K(b);N_SPINS(a),OGATEB,P-FLIGHT,XS(B)::QAR(A)
      • Refutation
        • P(c);
    • Try
      • Q(A);N_PINS(a)
      • Threat
        • DUALS(7)
      • Vars
        • S(a);::QAR(A)+S(B),XS(a)
      • Refutation
        • S(a);
    • Try
      • Q(A);CHECK,XS(a)
      • Vars
        • K(b);P-FLIGHT,XS(B)::QAB1(A)
      • Refutation
        • K(b);P-FLIGHT
  • Actual
    • S(B);
    • Threat
      • QAR(A)
    • Vars
      • K(b);N_SPINS(a),P-FLIGHT::QAR(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).