MESON Chess Problem Database

Problem Display
PID: 80773 (3Q4/r1nb2q1/4p2N/1p1Pp3/2P2Pp1/r3k1N1/5R2/B2R2K1 w - - 0 1)

Roura, Juan R

Comm., Good Companions (January), 1920

3Q4/r1nb2q1/4p2N/1p1Pp3/2P2Pp1/r3k1N1/5R2/B2R2K1

#2

10 + 10

3391 Het Half Pin Thema 1924

SOLUTION

  • SOUND
  • Sets
    • 1...Qf6
      • 2.Sxg4#
    • 1...Qf8
      • 2.Sxg4#
    • 1...Qh8
      • 2.Sxg4#
    • 1...Qe7
      • 2.Sxg4#
    • 1...Qf7
      • 2.Sxg4#
    • 1...Qh7
      • 2.Sxg4#
    • 1...Rd3
      • 2.Re1#
    • 1...Se8
      • 2.Qb6#
    • 1...e4
      • 2.Sf1#
  • Tries
    • 1.Qf8?
      • threat
        • 2.Qc5#
      • 1...Qxf8
        • 2.Sxg4#
      • 1...exf4
        • 2.Qxf4#
      • 1...Qe7
        • 2.Sxg4#
      • 1...Rd3
        • 2.Re1#
      • 1...Sa6
        • 2.Qxa3#
      • 1...e4
        • 2.Sf1#
      • 1...exd5!
  • Keys
    • 1.Qe7!
      • threat
        • 2.Qc5#
      • 1...Qxe7
        • 2.Sxg4#
      • 1...exf4
        • 2.Shf5#
      • 1...exd5
        • 2.Bd4#
      • 1...Qf8
        • 2.Sxg4#
      • 1...Rd3
        • 2.Re1#
      • 1...Sa6
        • 2.Qxa3#
      • 1...e4
        • 2.Sf1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 5
  • Sets
    • Q(j);N_GUARD::S(I),XP(c)
    • R(a);SBLOCK::R(B)
    • S(h);OGATE::QAB(J)
    • P(e);SBLOCK::S(E)
  • Tries
    • Try
      • Q(J);
      • Threat
        • QAB(J)
      • Vars
        • Q(j);N_GUARD,XQ(J)::S(I),XP(c)
        • P(e);OGATE,XP(G)::QAB1(J),XP(e)
        • Q(j);N_GUARD::S(I),XP(c)
        • R(a);SBLOCK::R(B)
        • S(h);S_CUTR(g)::QAR(J),XR(a)
        • P(e);SBLOCK::S(E)
      • Refutation
        • P(f);XP(H)
  • Actual
    • Q(J);
    • Threat
      • QAB(J)
    • Vars
      • Q(j);N_GUARD,XQ(J)::S(I),XP(c)
      • P(e);P_SPINP(f),XP(G)::S(I)
      • P(f);P_SPINP(e),XP(H)::B(A)
      • Q(j);N_GUARD::S(I),XP(c)
      • R(a);SBLOCK::R(B)
      • S(h);S_CUTR(g)::QAR(J),XR(a)
      • P(e);SBLOCK::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).