MESON Chess Problem Database

Problem Display
PID: 187850 (1Q6/8/p2p4/N2r4/kP4R1/N7/1P1p4/3K4 w - - 0 1)

Berger, Johann Nepomuk

Vasarnapi Ujsag, 1910

1Q6/8/p2p4/N2r4/kP4R1/N7/1P1p4/3K4

#2

7 + 5

6490 yacpdb 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Rd3
      • 2.Qe8#
  • Tries
    • 1.Sb1?
      • threat
        • 2.Sc3#
        • 2.b3#
      • 1...Rd3
        • 2.Qe8#
      • 1...Rc5
        • 2.b3#
      • 1...Rxa5!
    • 1.Sc2?
      • threat
        • 2.b3#
      • 1...Rd3
        • 2.Qe8#
      • 1...Rxa5!
    • 1.Qc7?
      • threat
        • 2.Qc2#
      • 1...Rd3
        • 2.Qc6#
        • 2.Qd7#
      • 1...Rc5
        • 2.bxc5#
      • 1...Rd4!
    • 1.b5+?
      • 1...Kxa5
        • 2.Qc7#
        • 2.Qd8#
      • 1...Rd4!
  • Keys
    • 1.Qg8!
      • 1...Rxa5
        • 2.b5#
      • 1...Rd4
        • 2.Qb3#
      • 1...Rd3
        • 2.Qe8#
      • 1...Rb5
        • 2.Qb3#
      • 1...Rc5
        • 2.Qb3#
      • 1...Re5
        • 2.Qb3#
      • 1...Rf5
        • 2.Qb3#
      • 1...Rg5
        • 2.Qb3#
      • 1...Rh5
        • 2.Qb3#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 8
    • REMOVED MATES = 0
  • Sets
    • R(c);N_GUARD::QAB(G)
  • Tries
    • Try
      • S(C);
      • Threat
        • DUALS(2)
      • Vars
        • R(c);N_GUARD::QAB(G)
        • R(c);::P(B)
      • Refutation
        • R(c);XS(F)
    • Try
      • S(C);
      • Threat
        • P(B)
      • Vars
        • R(c);N_GUARD::QAB(G)
      • Refutation
        • R(c);XS(F)
    • Try
      • Q(G);
      • Threat
        • QAB(G)
      • Vars
        • R(c);OGATE::R(E)+P(D),XR(c)
      • Refutation
        • R(c);
    • Try
      • P(D);CHECK
      • Refutation
        • R(c);P_SPINR(c)
  • Actual
    • Q(G);
    • Vars
      • R(c);N_GUARD,SBLOCK,XS(F)::R(E)+P(D)
      • R(c);OGATE::QAB1(G)
      • R(c);N_GUARD::QAB(G)
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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).