MESON Chess Problem Database

Problem Display
PID: 63947 (7Q/4p3/b1RBPn2/5RN1/3k4/8/3r1Pn1/4N1bK w - - 0 1)

Watson, George

Chess, 1946

7Q/4p3/b1RBPn2/5RN1/3k4/8/3r1Pn1/4N1bK

#2

9 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Rd3
      • 2.Sc2#
    • 1...Bd3
      • 2.Sef3#
    • 1...exd6
      • 2.Qxf6#
  • Tries
    • 1.Qd8?
      • threat
        • 2.Be5#
        • 2.Qb6#
      • 1...Rxf2
        • 2.Qb6#
      • 1...Bxf2
        • 2.Qb6#
      • 1...Sxe1
        • 2.Be5#
      • 1...exd6
        • 2.Qb6#
        • 2.Qxf6#
      • 1...Bc4
        • 2.Be5#
      • 1...Rb2
        • 2.Be5#
      • 1...Rc2
        • 2.Be5#
      • 1...Se4
        • 2.Sgf3#
        • 2.Be5#
      • 1...Sd5
        • 2.Be5#
      • 1...Sd7!
  • Keys
    • 1.Qh3!
      • threat
        • 2.Qc3#
      • 1...Rc2
        • 2.Sxc2#
      • 1...Rd3
        • 2.Sc2#
      • 1...Bd3
        • 2.Sef3#
      • 1...Bc4
        • 2.Bc5#
      • 1...Se3
        • 2.Qxe3#
      • 1...Se4
        • 2.Sgf3#
      • 1...Sd5
        • 2.Be5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 1
  • Sets
    • R(b);N_GUARD,SBLOCK::S(A)
    • B(e);SBLOCK::S(A)
    • P(g);N_GUARD,XB(G)::QAB(I),XS(f)
  • Tries
    • Try
      • Q(I);N_PINS(f)
      • Threat
        • DUALS(2)
      • Vars
        • R(b);XP(C)::QAB(I)
        • B(a);XP(C)::QAB(I)
        • S(c);XS(A)::QAR(I)+B(G),DCHECK
        • B(e);::QAR(I)+B(G),DCHECK
        • R(b);::QAR(I)+B(G),DCHECK
        • S(f);::B(G)
      • Refutation
        • S(f);
  • Actual
    • Q(I);N_PINS(f)
    • Threat
      • QAB1(I)
    • Vars
      • R(b);N_GUARD::S(A),XR(b)
      • R(b);N_GUARD::S(A)
      • B(e);SBLOCK::S(A)
      • B(e);SBLOCK::B(G)
      • S(c);N_GUARD::QAB1(I),XS(c)
      • S(f);SBLOCK::S(E)
      • S(f);SBLOCK::B(G)
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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).