MESON Chess Problem Database

Problem Display
PID: 66338 (1Q2K3/3R1P1b/5p2/1pp1pp2/q7/N2NkBP1/6P1/1R2B1b1 w - - 0 1)

Birnov, Zinovy Markovich

Tijdschrift vd NSB, 1931

1Q2K3/3R1P1b/5p2/1pp1pp2/q7/N2NkBP1/6P1/1R2B1b1

#2

11 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Qc2
      • 2.Sxc2#
    • 1...Qb4
      • 2.Sc2#
    • 1...Qe4
      • 2.Sc2#
    • 1...Qf4
      • 2.Sc2#
    • 1...Qg4
      • 2.Sc2#
    • 1...Qh4
      • 2.Sc2#
    • 1...Qa5
      • 2.Sc2#
    • 1...Qa6
      • 2.Sc2#
    • 1...Qa7
      • 2.Sc2#
    • 1...Qa8
      • 2.Sc2#
    • 1...b4
      • 2.Sc4#
    • 1...c4
      • 2.Qb6#
    • 1...e4
      • 2.Qf4#
  • Tries
    • 1.Rd1?
      • threat
        • 2.Bd2#
      • 1...Qc2
        • 2.Sxc2#
      • 1...Qb4
        • 2.Sc2#
      • 1...Qd4
        • 2.Sc2#
      • 1...Qa5
        • 2.Sc2#
      • 1...Qxd1!
    • 1.Qxe5+?
      • 1...Qe4
        • 2.Sc2#
      • 1...fxe5!
  • Keys
    • 1.Sf2!
      • threat
        • 2.Rd3#
      • 1...Qxa3
        • 2.Sd1#
      • 1...Bxf2
        • 2.Bd2#
      • 1...Qd1
        • 2.Sxd1#
      • 1...Qc2
        • 2.Sxc2#
      • 1...Qb3
        • 2.Rxb3#
      • 1...Qc4
        • 2.Sd1#
      • 1...Qd4
        • 2.Sc2#
      • 1...Qe4
        • 2.Sd1#
      • 1...b4
        • 2.Sc4#
      • 1...c4
        • 2.Qb6#
      • 1...e4
        • 2.Qf4#
      • 1...f4
        • 2.Sg4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 7
    • REMOVED MATES = 8
  • Sets
    • Q(c);N_GUARD::S(D),XQ(c)
    • Q(c);N_GUARD::S(D)
    • Q(c);N_GUARD,P_PINQ(J)::S(D)
    • P(d);N_GUARD,P_PINR(H),S_CUTQ(c)::S(D)
    • P(e);OGATEB::QAB(J)
    • P(f);OGATE::QAB1(J)
  • Tries
    • Try
      • R(A);
      • Threat
        • B(B)
      • Vars
        • Q(c);N_GUARD::S(D),XQ(c)
        • Q(c);N_GUARD::S(D)
      • Refutation
        • Q(c);XR(A)
    • Try
      • Q(J);CHECK,XP(f)
      • Vars
        • Q(c);P_PINQ(J),P_SPINQ(c)::S(D)
      • Refutation
        • P(h);XQ(J)
  • Actual
    • S(E);
    • Threat
      • R1(H)
    • Vars
      • Q(c);N_GUARD,XS(D)::S(E)
      • B(a);SBLOCK,XS(E)::B(B)
      • Q(c);N_GUARD::S(E),XQ(c)
      • Q(c);N_GUARD::S(D),XQ(c)
      • Q(c);N_GUARD::R(A),XQ(c)
      • Q(c);N_GUARD::S(E)
      • Q(c);N_GUARD::S(D)
      • P(d);N_GUARD,P_PINR(H),S_CUTQ(c)::S(D)
      • P(e);OGATEB::QAB(J)
      • P(f);OGATE::QAB1(J)
      • P(g);N_GUARD,S_CUTQ(c)::S(E)
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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).