MESON Chess Problem Database

Problem Display
PID: 72314 (6QB/2Np4/8/1bp1p2K/1n1k2p1/2R1p1p1/1r1nq1B1/2R3N1 w - - 0 1)

Casa, Alex

1st Prize, Chess, 1953

6QB/2Np4/8/1bp1p2K/1n1k2p1/2R1p1p1/1r1nq1B1/2R3N1

#2

8 + 12

SOLUTION

  • SOUND
  • Sets
    • 1...Qd1
      • 2.Sxb5#
    • 1...Qe1
      • 2.Sxb5#
    • 1...Qf2
      • 2.Sxb5#
    • 1...Ba4
      • 2.Sxe2#
    • 1...Bc6
      • 2.Sxe2#
    • 1...Sf3
      • 2.Qxg4#
    • 1...Sc4
      • 2.Sxb5#
    • 1...Sa2
      • 2.Qd5#
    • 1...Sd3
      • 2.Sxe2#
      • 2.Qd5#
    • 1...Sd5
      • 2.Qxd5#
    • 1...Sa6
      • 2.Qd5#
    • 1...Sc6
      • 2.Qd5#
    • 1...d5
      • 2.Se6#
    • 1...d6
      • 2.Se6#
  • Tries
    • 1.Qe6?
      • threat
        • 2.Bxe5#
        • 2.Qxe5#
      • 1...Qxg2
        • 2.Qxe5#
      • 1...dxe6
        • 2.Sxe6#
      • 1...Qf3
        • 2.Qxe5#
      • 1...Sf3
        • 2.Qxg4#
      • 1...c4
        • 2.Qxe5#
        • 2.Qb6#
      • 1...Sc4
        • 2.Sxb5#
      • 1...Sd3
        • 2.Sxe2#
        • 2.Qd5#
        • 2.Qd6#
      • 1...Sc6
        • 2.Qd5#
        • 2.Qxd7#
        • 2.Qd6#
      • 1...d6!
    • 1.Qg5?
      • threat
        • 2.Bxe5#
        • 2.Qxe5#
      • 1...Qxg2
        • 2.Qxe3#
        • 2.Qxe5#
      • 1...Qf3
        • 2.Qxe5#
      • 1...Sf3
        • 2.Qf4#
        • 2.Qxg4#
      • 1...c4
        • 2.Qxe5#
      • 1...Sc4
        • 2.Sxb5#
        • 2.Qf4#
      • 1...Sd3
        • 2.Sxe2#
      • 1...d6
        • 2.Se6#
      • 1...Sc6!
    • 1.Qe8?
      • threat
        • 2.Bxe5#
        • 2.Qxe5#
      • 1...Qxg2
        • 2.Qxe5#
      • 1...Qf3
        • 2.Qxe5#
      • 1...c4
        • 2.Qxe5#
      • 1...Sc4
        • 2.Sxb5#
      • 1...Sd3
        • 2.Sxe2#
      • 1...Sc6
        • 2.Qxd7#
      • 1...d6
        • 2.Se6#
      • 1...Sf3!
  • Keys
    • 1.Qg7!
      • threat
        • 2.Qxe5#
      • 1...Sf3
        • 2.Qxg4#
      • 1...Sc4
        • 2.Sxb5#
      • 1...Sd3
        • 2.Sxe2#
      • 1...Sc6
        • 2.Qxd7#
      • 1...d6
        • 2.Se6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 9
  • Sets
    • Q(c);N_GUARD::S(F),XB(i)
    • B(i);N_GUARD::S(B),XQ(c)
    • S(b);N_GUARD,S_CUTQ(c)::QAR(G),XP(h)
    • S(b);S_CUTQ(c)::S(F),XB(i)
    • S(f);N_GUARD::QAR1(G)
    • S(f);N_GUARD::QAR1(G),XS(f)
    • P(l);N_GUARD::S(F)
  • Tries
    • Try
      • Q(G);
      • Threat
        • DUALS(2)
      • Vars
        • Q(c);XB(C)::QAB1(G),XP(k)
        • P(l);XQ(G)::S(F),XP(l)
        • Q(c);::QAB1(G),XP(k)
        • S(b);N_GUARD,S_CUTQ(c)::QAR(G),XP(h)
        • S(b);S_CUTQ(c)::S(F),XB(i)
      • Refutation
        • P(l);
    • Try
      • Q(G);
      • Threat
        • DUALS(2)
      • Vars
        • Q(c);::QAB1(G),XP(k)
        • P(j);::QAB1(G),XP(k)
        • S(f);S_CUTB(i)::S(B),XQ(c)
        • P(l);N_GUARD::S(F)
      • Refutation
        • S(f);
    • Try
      • Q(G);
      • Threat
        • DUALS(2)
      • Vars
        • Q(c);XB(C)::QAB1(G),XP(k)
        • Q(c);::QAB1(G),XP(k)
        • P(j);::QAB1(G),XP(k)
        • S(b);S_CUTQ(c)::S(F),XB(i)
        • S(f);S_CUTB(i)::S(B),XQ(c)
        • S(f);N_GUARD,S_CUTB(i)::QAR(G),XP(l)
        • P(l);N_GUARD::S(F)
      • Refutation
        • S(b);
  • Actual
    • Q(G);
    • Threat
      • QAB1(G),XP(k)
    • Vars
      • S(b);N_GUARD,S_CUTQ(c)::QAR(G),XP(h)
      • S(b);S_CUTQ(c)::S(F),XB(i)
      • S(f);S_CUTB(i)::S(B),XQ(c)
      • S(f);N_GUARD,S_CUTB(i)::QAR(G),XP(l)
      • P(l);N_GUARD::S(F)
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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).