MESON Chess Problem Database

Problem Display
PID: 12046 (1B4n1/3Kpr2/4P3/RP1kP2R/1PpNNp2/2P2p2/4P3/rB1Q1q2 w - - 0 1)

Lepage, Roger

Die Schwalbe, 1974

1B4n1/3Kpr2/4P3/RP1kP2R/1PpNNp2/2P2p2/4P3/rB1Q1q2

#2

14 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Qxe2
      • 2.Sxe2#
    • 1...Qg2
      • 2.Sb3#
      • 2.Sxf3#
      • 2.Sf5#
      • 2.Sc6#
    • 1...Qh3
      • 2.Sb3#
      • 2.Sxf3#
      • 2.Sf5#
      • 2.Sc6#
    • 1...Rf6
      • 2.exf6#
    • 1...Sf6+
      • 2.exf6#
  • Tries
    • 1.Sc2+?
      • 1...Kxe4
        • 2.Qd4#
      • 1...Qxd1!
    • 1.Sd2?
      • threat
        • 2.Be4#
      • 1...Sf6+
        • 2.exf6#
      • 1...Rxb1
        • 2.b6#
      • 1...Qxe2!
    • 1.Sf2?
      • threat
        • 2.Be4#
      • 1...Sf6+
        • 2.exf6#
      • 1...Qxe2
        • 2.Sxe2#
      • 1...Rxb1
        • 2.b6#
      • 1...Qxf2!
    • 1.Sc5?
      • threat
        • 2.Be4#
      • 1...Sf6+
        • 2.exf6#
      • 1...Qxe2
        • 2.Sxe2#
      • 1...Rxb1!
    • 1.Sg5?
      • threat
        • 2.Be4#
      • 1...Qxe2
        • 2.Sxe2#
      • 1...Rxb1
        • 2.b6#
      • 1...Sf6+!
    • 1.Sf6+?
      • 1...Rxf6
        • 2.exf6#
      • 1...Sxf6+
        • 2.exf6#
      • 1...exf6+!
  • Keys
    • 1.Sg3!
      • threat
        • 2.Be4#
      • 1...Sf6+
        • 2.exf6#
      • 1...Qxe2
        • 2.Sdxe2#
      • 1...Rxb1
        • 2.b6#
      • 1...fxg3
        • 2.e4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • Q(b);XP(C)::QAR(B)+S(F),XQ(b)
    • R(h);OGATE::R(K)+P(J),XR(h)
    • S(i);CHECK,OGATE::R(K)+P(J),XS(i)
  • Tries
    • Try
      • S(F);CHECK
      • Vars
        • K(f);S_FLIGHT,XS(G)::QAR1(B)
      • Refutation
        • Q(b);XQ(B)
    • Try
      • S(G);
      • Threat
        • B(A)
      • Vars
        • S(i);CHECK,OGATE::R(K)+P(J),XS(i)
        • R(a);N_GUARD,XB(A)::R(H)+P(I)
      • Refutation
        • Q(b);XP(C)
    • Try
      • S(G);
      • Threat
        • B(A)
      • Vars
        • S(i);CHECK,OGATE::R(K)+P(J),XS(i)
        • Q(b);XP(C)::QAR(B)+S(F),XQ(b)
        • R(a);N_GUARD,XB(A)::R(H)+P(I)
      • Refutation
        • Q(b);XS(G)
    • Try
      • S(G);
      • Threat
        • B(A)
      • Vars
        • S(i);CHECK,OGATE::R(K)+P(J),XS(i)
        • Q(b);XP(C)::QAR(B)+S(F),XQ(b)
      • Refutation
        • R(a);XB(A)
    • Try
      • S(G);
      • Threat
        • B(A)
      • Vars
        • Q(b);XP(C)::QAR(B)+S(F),XQ(b)
        • R(a);N_GUARD,XB(A)::R(H)+P(I)
      • Refutation
        • S(i);CHECK
    • Try
      • S(G);CHECK
      • Vars
        • R(h);OGATE,XS(G)::R(K)+P(J),XR(h)
        • S(i);CHECK,OGATE,XS(G)::R(K)+P(J),XS(i)
      • Refutation
        • P(g);CHECK,XS(G)
  • Actual
    • S(G);
    • Threat
      • B(A)
    • Vars
      • S(i);CHECK,OGATE::R(K)+P(J),XS(i)
      • Q(b);XP(C)::QAR(B)+S(F),XQ(b)
      • R(a);N_GUARD,XB(A)::R(H)+P(I)
      • P(e);N_GUARD,XS(G)::P(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).