MESON Chess Problem Database

Problem Display
PID: 117091 (4Bb2/6pq/bR2N3/3k2N1/3P1Pp1/nP1p3p/K1P1P1r1/7Q w - - 0 1)

Kubbel, Leonid Ivanovich (AKA Kubbel, Karl Artur Leonid)

Smena, 1937

4Bb2/6pq/bR2N3/3k2N1/3P1Pp1/nP1p3p/K1P1P1r1/7Q

#2

11 + 10

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qg8
      • 2.e4#
    • 1...Qh4
      • 2.e4#
    • 1...Qh5
      • 2.e4#
    • 1...Qh6
      • 2.e4#
    • 1...Qh8
      • 2.e4#
    • 1...Bd6
      • 2.Bc6#
    • 1...Sb5
      • 2.c4#
    • 1...g6
      • 2.e4#
  • Tries
    • 1.Qxg2+?
      • 1...Qe4
        • 2.Qxe4#
      • 1...hxg2!
    • 1.c3?
      • threat
        • 2.Sc7#
      • 1...Bd6
        • 2.Bc6#
      • 1...Sb5
        • 2.c4#
      • 1...g6!
    • 1.e3?
      • threat
        • 2.Sc7#
      • 1...Bd6
        • 2.Bc6#
      • 1...g6
        • 2.e4#
      • 1...Sb5!
  • Keys
    • 1.Qa1!
      • threat
        • 2.Sc7#
      • 1...Bd6
        • 2.Bc6#
      • 1...Sb5
        • 2.c4#
      • 1...g6
        • 2.e4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 5
  • Sets
    • Q(i);N_GUARD::P(D)
    • B(j);SBLOCK::B(K)
    • S(b);N_GUARD,S_CUTB(g)::P(C)
    • P(h);S_CUTQ(i)::P(D)
  • Tries
    • Try
      • Q(A);CHECK,XR(a)
      • Vars
        • Q(i);N_GUARD,P_SPINQ(i)::QAB1(A),XQ(i)
      • Refutation
        • P(d);XQ(A)
    • Try
      • P(C);P_SPINP(D)
      • Threat
        • S(J)
      • Vars
        • B(j);SBLOCK::B(K)
        • S(b);N_GUARD,S_CUTB(g)::P(C)
      • Refutation
        • P(h);
    • Try
      • P(D);P_SPINP(C)
      • Threat
        • S(J)
      • Vars
        • B(j);SBLOCK::B(K)
        • P(h);S_CUTQ(i)::P(D)
      • Refutation
        • S(b);
  • Actual
    • Q(A);N_PINR(a)
    • Threat
      • S(J)
    • Vars
      • B(j);SBLOCK::B(K)
      • S(b);N_GUARD,S_CUTB(g)::P(C)
      • P(h);S_CUTQ(i)::P(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).