MESON Chess Problem Database

Problem Display
PID: 95247 (rbn5/N7/k1Pp4/3Np3/4P3/8/3B4/K4nQ1 w - - 0 1)

Vasta, Jan

Deutsches Wochenschach, 1913

rbn5/N7/k1Pp4/3Np3/4P3/8/3B4/K4nQ1

#2

7 + 7

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Rxa7
      • 2.Qxf1#
    • 1...Bxa7
      • 2.Sc7#
      • 2.Qxf1#
    • 1...Bc7
      • 2.Sxc7#
    • 1...Sb6
      • 2.Qxb6#
    • 1...Sxa7
      • 2.Qb6#
    • 1...Se7
      • 2.Qb6#
  • Tries
    • 1.Qe3?
      • threat
        • 2.Qa3#
      • 1...Rxa7
        • 2.Qe2#
        • 2.Qd3#
      • 1...Bxa7
        • 2.Sc7#
        • 2.Qe2#
        • 2.Qd3#
      • 1...Sxa7
        • 2.Qb6#
      • 1...Sb6
        • 2.Qxb6#
      • 1...Bc7
        • 2.Sxc7#
      • 1...Sxe3!
    • 1.Qd4?
      • threat
        • 2.Qa4#
      • 1...Sb6
        • 2.Qxb6#
      • 1...Bc7
        • 2.Sxc7#
      • 1...exd4!
    • 1.Qc5?
      • threat
        • 2.Sb4#
        • 2.Qa3#
        • 2.Qa5#
      • 1...Rxa7
        • 2.Sb4#
        • 2.Qc4#
        • 2.Qa5#
      • 1...Bxa7
        • 2.Sb4#
        • 2.Sc7#
        • 2.Qc4#
        • 2.Qa5#
      • 1...Sxd2
        • 2.Sb4#
        • 2.Qa3#
      • 1...Sxa7
        • 2.Sb4#
        • 2.Qb6#
        • 2.Qa5#
      • 1...Sb6
        • 2.Qxb6#
        • 2.Qa5#
      • 1...Bc7
        • 2.Sb4#
        • 2.Sxc7#
      • 1...dxc5!
  • Keys
    • 1.Kb2!
      • 1...Rxa7
        • 2.Qxf1#
      • 1...Bxa7
        • 2.Sc7#
        • 2.Qxf1#
      • 1...Sxd2
        • 2.Qa1#
      • 1...Sxa7
        • 2.Qb6#
      • 1...Se3
        • 2.Qa1#
      • 1...Sb6
        • 2.Qxb6#
      • 1...Bc7
        • 2.Sxc7#
      • 1...Sh2
        • 2.Qa1#
      • 1...Sg3
        • 2.Qa1#
      • 1...Se7
        • 2.Qb6#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • R(e);SBLOCK,XS(G)::QAB(B),XS(a)
    • B(f);N_GUARD::S(E),XB(f)
    • S(g);N_GUARD::QAR1(B),XS(g)
    • S(g);N_GUARD,XS(G)::QAR1(B)
    • S(g);N_GUARD::QAR1(B)
  • Tries
    • Try
      • Q(B);
      • Threat
        • QAR(B)
      • Vars
        • S(g);N_GUARD,XS(G)::QAR1(B)
        • S(g);N_GUARD::QAR1(B),XS(g)
        • B(f);N_GUARD::S(E),XB(f)
      • Refutation
        • S(a);XQ(B)
    • Try
      • Q(B);
      • Threat
        • QAR2(B)
      • Vars
        • S(g);N_GUARD::QAR1(B),XS(g)
        • B(f);N_GUARD::S(E),XB(f)
      • Refutation
        • P(b);XQ(B)
    • Try
      • Q(B);
      • Threat
        • DUALS(3)
      • Refutation
        • P(d);XQ(B)
  • Actual
    • K(A);S_FLIGHT
    • Vars
      • R(e);SBLOCK,XS(G)::QAB(B),XS(a)
      • S(a);OGATE,XB(C)::QAR(B)
      • S(g);N_GUARD,XS(G)::QAR1(B)
      • S(a);OGATE::QAR(B)
      • S(g);N_GUARD::QAR1(B),XS(g)
      • B(f);N_GUARD::S(E),XB(f)
      • S(g);N_GUARD::QAR1(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).