MESON Chess Problem Database

Problem Display
PID: 138915 (5Q2/2p1p2B/2RRP3/rp1p1nr1/3k1PPb/1p6/2bNPP2/q2NnKB1 w - - 0 1)

Fontaine, Leon

Probleemblad, 1974

5Q2/2p1p2B/2RRP3/rp1p1nr1/3k1PPb/1p6/2bNPP2/q2NnKB1

#2

13 + 13

SOLUTION

  • SOUND
  • Sets
    • 1...Be4
      • 2.Sxb3#
    • 1...Se3+
      • 2.fxe3#
    • 1...Sg3+
      • 2.fxg3#
    • 1...Sxd6
      • 2.e3#
    • 1...Sh6
      • 2.e3#
    • 1...Sg7
      • 2.e3#
    • 1...b4
      • 2.Rc4#
    • 1...exd6
      • 2.Qf6#
  • Tries
    • 1.Qg7+?
      • 1...Sxg7
        • 2.e3#
      • 1...Rxg7!
    • 1.Qh8+?
      • 1...Sg7
        • 2.e3#
      • 1...Rg7!
    • 1.e3+?
      • 1...Sxe3+
        • 2.fxe3#
      • 1...Kd3!
    • 1.f3+?
      • 1...Se3+
        • 2.Bxe3#
      • 1...Bf2!
  • Keys
    • 1.Qd8!
      • threat
        • 2.Rxd5#
      • 1...Se3+
        • 2.fxe3#
      • 1...Sg3+
        • 2.fxg3#
      • 1...Sxd6
        • 2.e3#
      • 1...cxd6
        • 2.Qb6#
      • 1...exd6
        • 2.Qf6#
      • 1...Be4
        • 2.Sxb3#
      • 1...Sh6
        • 2.e3#
      • 1...Sg7
        • 2.e3#
      • 1...b4
        • 2.Rc4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • B(c);N_GUARD,SBLOCK::S(D),XP(d)
    • S(j);CHECK,OGATE::P(F),XS(j)
    • S(j);CHECK,OGATE::B(C)+P(F),XS(j)
    • S(j);N_GUARD,N_SPINP(i),XR(J)::P(E)
    • S(j);N_GUARD::P(E)
    • P(h);N_GUARD::R1(I)
    • P(m);N_GUARD,N_SPINP(i),XR(J)::QAB(M)
  • Tries
    • Try
      • Q(M);CHECK
      • Vars
        • S(j);XQ(M)::P(E)
      • Refutation
        • R(k);XQ(M)
    • Try
      • Q(M);CHECK
      • Vars
        • S(j);P_SPINS(j)::P(E)
      • Refutation
        • R(k);P_SPINR(k)
    • Try
      • P(E);CHECK
      • Vars
        • S(j);CHECK,OGATE,XP(E)::P(F),XS(j)
      • Refutation
        • K(e);P-FLIGHT,P_SPINS(j)
    • Try
      • P(F);CHECK
      • Vars
        • S(j);CHECK,N_GUARD,P_SPINS(j)::B(C),XS(j)
      • Refutation
        • B(f);P_SPINB(f)
  • Actual
    • Q(M);
    • Threat
      • R1(J),XP(i)
    • Vars
      • S(j);CHECK,OGATE::P(F),XS(j)
      • S(j);CHECK,OGATE::B(C)+P(F),XS(j)
      • S(j);N_GUARD,N_SPINP(i),XR(J)::P(E)
      • P(l);N_SPINP(i),OGATE,XR(J)::QAB(M)
      • P(m);N_SPINP(i),OGATE,XR(J)::QAB(M)
      • B(c);N_GUARD,SBLOCK::S(D),XP(d)
      • S(j);N_GUARD::P(E)
      • P(h);N_GUARD::R1(I)
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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).