MESON Chess Problem Database

Problem Display
PID: 273986 (8/2p1Ppn1/5k1p/4b3/1QB4N/2N3p1/3BR3/K7 w - - 0 1)

Ekstrom, Sven Johan Adrian

Schackvarlden, 1940

8/2p1Ppn1/5k1p/4b3/1QB4N/2N3p1/3BR3/K7

#2

8 + 7

15601 Albrecht-Leiss-Degener Collection 2023

SOLUTION

  • SOUND
  • Sets
    • 1...Bxc3+
      • 2.Qxc3#
    • 1...Bd6
      • 2.Sd5#
    • 1...Sf5
      • 2.e8S#
    • 1...Sh5
      • 2.e8S#
    • 1...Se6
      • 2.e8S#
  • Tries
    • 1.Qd6+?
      • 1...Bxd6
        • 2.Sd5#
      • 1...Se6
        • 2.e8S#
      • 1...cxd6!
  • Keys
    • 1.Qc5!
      • threat
        • 2.Qxe5#
      • 1...Bxc3+
        • 2.Bxc3#
      • 1...Se6
        • 2.e8S#
      • 1...Bd4
        • 2.Qxd4#
      • 1...Bf4
        • 2.Se4#
      • 1...Bd6
        • 2.Sd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • B(b);CHECK,OGATE,XS(D)::QAB(E),XB(b)
    • B(b);N_PINS(D)::S(D)
    • S(g);N_GUARD::P=S
  • Tries
    • Try
      • Q(E);CHECK
      • Vars
        • B(b);N_PINS(D),XQ(E)::S(D)
        • S(g);N_GUARD,P_SPINS(g),S_CUTB(b),S_CUTP(e)::P=S
      • Refutation
        • P(e);XQ(E)
  • Actual
    • Q(E);
    • Threat
      • QAB1(E),XB(b)
    • Vars
      • B(b);CHECK,OGATE,XS(D)::B(B),XB(b)
      • S(g);N_GUARD::P=S
      • B(b);OGATEB::QAB(E),XB(b)
      • B(b);N_PINS(D)::S(D)
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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).