MESON Chess Problem Database

Problem Display
PID: 89393 (7B/8/5P2/K2pkq2/1Q3N1N/2R1p2p/4b3/5n2 w - - 0 1)

Berg, Ludwig

Zlata Praha, 1918

7B/8/5P2/K2pkq2/1Q3N1N/2R1p2p/4b3/5n2

#2

7 + 7

6490 yacpdb 2009
5454 Near Snap 2010

SOLUTION

  • SOUND
  • Sets
    • 1...Qb1
      • 2.f7#
    • 1...Qc2
      • 2.f7#
    • 1...Qd3
      • 2.f7#
    • 1...Qe6
      • 2.Sfg6#
    • 1...Qd7
      • 2.f7#
    • 1...Bd3
      • 2.Sf3#
    • 1...Bf3
      • 2.Sxf3#
    • 1...Bb5
      • 2.Sf3#
    • 1...Ba6
      • 2.Sf3#
  • Tries
    • 1.Sfg6+?
      • 1...Ke6
        • 2.Qe7#
      • 1...Qxg6!
  • Keys
    • 1.Rd3!
      • threat
        • 2.Rxd5#
      • 1...Qxd3
        • 2.f7#
      • 1...Qxf4
        • 2.Qe7#
      • 1...Bxd3
        • 2.Sf3#
      • 1...Qe4
        • 2.Qb8#
      • 1...d4
        • 2.Qxd4#
      • 1...Qe6
        • 2.Sfg6#
      • 1...Qd7
        • 2.f7#
      • 1...Bf3
        • 2.Sxf3#

Anticipated by 9478(1904/I)

This anticipates 99348(1979)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 4
  • Sets
    • Q(g);N_GUARD::B(G)+P(F)
    • Q(g);N_GUARD,SBLOCK::S(C)
    • B(b);N_GUARD::S(D)
    • B(b);N_GUARD::S(D),XB(b)
  • Tries
    • Try
      • S(C);CHECK
      • Vars
        • K(f);P-FLIGHT::QAR1(B)
      • Refutation
        • Q(g);XS(C)
  • Actual
    • R(A);
    • Threat
      • R1(A),XP(e)
    • Vars
      • Q(g);N_GUARD,XR(A)::B(G)+P(F)
      • Q(g);N_GUARD,SBLOCK,XS(C)::QAR2(B)
      • B(b);N_GUARD,XR(A)::S(D)
      • Q(g);SBLOCK::QAB(B)
      • P(e);::QAB1(B),XP(e)
      • Q(g);N_GUARD,SBLOCK::S(C)
      • Q(g);N_GUARD::B(G)+P(F)
      • B(b);N_GUARD::S(D),XB(b)
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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).