MESON Chess Problem Database

Problem Display
PID: 143031 (2B3K1/2p1B3/5p2/R1rNk3/2Q2pP1/1bn1bP2/8/3R4 w - - 0 1)

Langlois, P

2nd Mention, diagrammes 01. Composition Exercise, 1973

2B3K1/2p1B3/5p2/R1rNk3/2Q2pP1/1bn1bP2/8/3R4

#2

9 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Rxa5
      • 2.Qxc7#
    • 1...Rb5
      • 2.Qxc7#
    • 1...Rxd5
      • 2.Qxc7#
    • 1...Bc1
      • 2.Qd4#
    • 1...Bg1
      • 2.Qxf4#
    • 1...Bf2
      • 2.Qxf4#
    • 1...Bd4
      • 2.Qxd4#
    • 1...Sb1
      • 2.Qe4#
    • 1...Sxd1
      • 2.Qe4#
    • 1...Sa2
      • 2.Qe4#
    • 1...Se2
      • 2.Qe4#
    • 1...Sa4
      • 2.Qe4#
    • 1...Se4
      • 2.Qxe4#
    • 1...Sb5
      • 2.Qe4#
    • 1...Sxd5
      • 2.Qe4#
  • Tries
    • 1.Sb4?
      • threat
        • 2.Sd3#
        • 2.Sc6#
      • 1...Bc2
        • 2.Sc6#
        • 2.Qe6#
      • 1...Ba4
        • 2.Sd3#
        • 2.Qe6#
      • 1...Sb5
        • 2.Sd3#
      • 1...Sd5
        • 2.Sd3#
        • 2.Qe4#
      • 1...c6
        • 2.Sd3#
        • 2.Sxc6#
        • 2.Bd6#
      • 1...Bxc4+!
    • 1.Sxf6?
      • threat
        • 2.Sd7#
      • 1...Rd5
        • 2.Qxc7#
      • 1...Ba4
        • 2.Qe6#
      • 1...Sd5
        • 2.Qe4#
      • 1...Bxc4+!
    • 1.Qxc3+?
      • 1...Bd4
        • 2.Qxd4#
      • 1...Rxc3!
  • Keys
    • 1.Sb6!
      • threat
        • 2.Sd7#
      • 1...Bxc4+
        • 2.Sxc4#
      • 1...cxb6
        • 2.Bd6#
      • 1...Rd5
        • 2.Qxc7#
      • 1...Ba4
        • 2.Qe6#
      • 1...Sd5
        • 2.Qe4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 13
  • Sets
    • R(e);OGATE,XR(E)::QAB(C),XP(h)
    • R(e);OGATE::QAB(C),XP(h)
    • R(e);OGATE,P_SPINR(e),XS(F)::QAB(C),XP(h)
    • B(c);N_GUARD::QAB1(C)
    • B(c);N_GUARD::QAB1(C),XP(d)
    • B(c);N_GUARD::QAB1(C),XB(c)
    • S(b);N_GUARD::QAR1(C)
    • S(b);N_GUARD,XR(A)::QAR1(C)
    • S(b);N_GUARD::QAR1(C),XS(b)
    • S(b);N_GUARD,XS(F)::QAR1(C)
  • Tries
    • Try
      • S(F);P_PINR(e),P_SPINQ(C)
      • Threat
        • DUALS(2)
      • Vars
        • S(b);N_SPINR(e)::S(F)
      • Refutation
        • B(a);CHECK,XQ(C)
    • Try
      • S(F);P_PINR(e),P_SPINQ(C),XP(g)
      • Threat
        • S(F)
      • Vars
        • R(e);N_PINQ(C)::QAB(C),XP(h)
        • B(a);N_GUARD,N_PINQ(C)::QAR1(C)
        • S(b);N_PINQ(C),N_SPINR(e)::QAR1(C)
      • Refutation
        • B(a);CHECK,XQ(C)
    • Try
      • Q(C);CHECK,P_SPINS(F),XS(b)
      • Vars
        • B(c);N_GUARD,P_SPINB(c)::QAB1(C),XB(c)
      • Refutation
        • R(e);XQ(C)
  • Actual
    • S(F);P_PINR(e),P_SPINQ(C)
    • Threat
      • S(F)
    • Vars
      • B(a);CHECK,XQ(C)::S(F),XB(a)
      • P(h);N_GUARD,XS(F)::B(G)
      • R(e);N_PINQ(C)::QAB(C),XP(h)
      • B(a);N_GUARD,N_PINQ(C)::QAR1(C)
      • S(b);N_PINQ(C),N_SPINR(e)::QAR1(C)
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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).