MESON Chess Problem Database

Problem Display
PID: 33022 (K1N1q1B1/1p3rr1/p4b2/4BQp1/1PkP4/1RNp4/P7/8 w - - 0 1)

Levman, Semyon Semyonovich

64 Shakhmatnoe obozrenie, 1929

K1N1q1B1/1p3rr1/p4b2/4BQp1/1PkP4/1RNp4/P7/8

#2

10 + 9

20 De Problemist 1929

SOLUTION

  • SOUND
  • Sets
    • 1...Qa4
      • 2.Sb6#
      • 2.Sd6#
      • 2.Qe6#
    • 1...Qb5
      • 2.Sd6#
    • 1...Qd7
      • 2.Sb6#
    • 1...Qe6
      • 2.Qxe6#
    • 1...Qe7
      • 2.Sb6#
    • 1...Qxc8+
      • 2.Qxc8#
    • 1...Qf8
      • 2.Qe6#
    • 1...Qxg8
      • 2.Qe6#
    • 1...Be7
      • 2.Qe6#
    • 1...Bd8
      • 2.Sd6#
    • 1...d2
      • 2.Qf1#
  • Tries
    • 1.Bxf7+?
      • 1...Qxf7
        • 2.Sb6#
        • 2.Sd6#
      • 1...Qe6
        • 2.Sb6#
        • 2.Sd6#
        • 2.Bxe6#
        • 2.Qxe6#
      • 1...Rxf7!
    • 1.Qe4?
      • threat
        • 2.Qd5#
        • 2.d5#
      • 1...Qxe5
        • 2.Sb6#
        • 2.dxe5#
      • 1...Bxe5
        • 2.Qd5#
        • 2.dxe5#
      • 1...Qb5
        • 2.Sd6#
        • 2.d5#
      • 1...Qc6
        • 2.d5#
      • 1...Qd7
        • 2.Sb6#
        • 2.d5#
      • 1...Qe6
        • 2.d5#
      • 1...Qd8
        • 2.d5#
      • 1...d2
        • 2.Qe2#
        • 2.d5#
      • 1...Qxc8+!
  • Keys
    • 1.Qg4!
      • threat
        • 2.d5#
      • 1...Qxc8+
        • 2.Qxc8#
      • 1...Qxe5
        • 2.Sb6#
        • 2.dxe5#
      • 1...Bxe5
        • 2.dxe5#
      • 1...d2
        • 2.Qe2#
      • 1...Qd7
        • 2.Sb6#
      • 1...Qe6
        • 2.Qxe6#
      • 1...Be7
        • 2.Qe6#
      • 1...Bd8
        • 2.Sd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 4
  • Sets
    • Q(i);N_PINS(I)::S(I)
    • Q(i);N_GUARD,N_PINS(I),N_SPINR(g)::QAB(G),XQ(i)
    • Q(i);CHECK,OGATE,XS(I)::QAR(G),XQ(i)
    • Q(i);N_GUARD::QAB(G)
    • Q(i);N_GUARD,N_SPINR(g),XB(J)::QAB(G)
    • B(e);S_CUTQ(i)::QAB(G)
    • B(e);N_PINS(I)::S(I)
    • P(a);OGATEB::QAB(G)
  • Tries
    • Try
      • B(J);CHECK,XR(g)
      • Refutation
        • R(h);XB(J)
    • Try
      • Q(G);
      • Threat
        • DUALS(2)
      • Vars
        • Q(i);N_PINS(I)::QAR(G)+P(E)
        • Q(i);N_PINS(I),N_SPINR(g)::QAR(G)+P(E)
        • Q(i);::QAR(G)+P(E)
      • Refutation
        • Q(i);CHECK,XS(I)
  • Actual
    • Q(G);
    • Threat
      • QAR(G)+P(E)
    • Vars
      • Q(i);CHECK,OGATE,XS(I)::QAR(G),XQ(i)
      • B(e);OGATE,XB(F)::QAR(G)+P(E),XB(e)
      • P(a);OGATEB::QAB(G)
      • Q(i);N_PINS(I)::S(I)
      • Q(i);N_GUARD,N_PINS(I),N_SPINR(g)::QAB(G),XQ(i)
      • B(e);S_CUTQ(i)::QAB(G)
      • B(e);N_PINS(I)::S(I)
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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).