MESON Chess Problem Database

Problem Display
PID: 142956 (1r6/1B1Qp3/1PP5/2K1p1BN/4k1p1/2pNppP1/3b1q2/5b2 w - - 0 1)

Beal, Edward W

diagrammes, 1973

1r6/1B1Qp3/1PP5/2K1p1BN/4k1p1/2pNppP1/3b1q2/5b2

#2

9 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Qxg3
      • 2.Sxg3#
    • 1...Ra8
      • 2.c7#
    • 1...Rc8
      • 2.c7#
    • 1...Rd8
      • 2.c7#
    • 1...Re8
      • 2.c7#
    • 1...Rf8
      • 2.c7#
    • 1...Rg8
      • 2.c7#
    • 1...Rh8
      • 2.c7#
    • 1...Bxd3
      • 2.Qxg4#
    • 1...e2+
      • 2.Sxf2#
    • 1...e6
      • 2.Qh7#
  • Tries
    • 1.Sb4?
      • threat
        • 2.Qxg4#
      • 1...Qxg3
        • 2.Sxg3#
      • 1...e6
        • 2.Qh7#
      • 1...Rf8
        • 2.c7#
      • 1...Bh3
        • 2.Qd3#
      • 1...e2+!
    • 1.Sg7?
      • threat
        • 2.Qf5#
        • 2.Qd5#
      • 1...e2+
        • 2.Sxf2#
      • 1...Rd8
        • 2.Qf5#
        • 2.c7#
      • 1...Rf8
        • 2.Qd5#
        • 2.c7#
      • 1...e6!
    • 1.Bxe7?
      • threat
        • 2.Sf6#
      • 1...Rf8
        • 2.c7#
      • 1...e2+!
    • 1.Bc8?
      • threat
        • 2.Qf5#
        • 2.Qd5#
      • 1...e2+
        • 2.Sxf2#
      • 1...e6
        • 2.Qh7#
      • 1...Rxc8!
  • Keys
    • 1.Kc4!
      • threat
        • 2.Qxg4#
      • 1...Bxd3+
        • 2.Qxd3#
      • 1...Qxg3
        • 2.Sxg3#
      • 1...e6
        • 2.Qh7#
      • 1...Rf8
        • 2.c7#
      • 1...Bh3
        • 2.Sc5#
      • 1...e2
        • 2.Sxf2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 6
  • Sets
    • Q(c);XP(B)::S(E),XQ(c)
    • R(k);N_GUARD::B(H)+P(G)
    • R(k);N_GUARD,P_PINP(G)::B(H)+P(G)
    • B(a);SBLOCK,XS(A)::QAR2(I),XP(h)
    • P(e);CHECK,N_GUARD::S(A),XQ(c)
    • P(j);OGATE::QAB(I)
  • Tries
    • Try
      • S(A);
      • Threat
        • QAR2(I),XP(h)
      • Vars
        • Q(c);XP(B)::S(E),XQ(c)
        • P(j);OGATE::QAB(I)
        • R(k);N_GUARD::B(H)+P(G)
        • B(a);N_GUARD::QAB1(I)
      • Refutation
        • P(e);CHECK
    • Try
      • S(E);
      • Threat
        • DUALS(2)
      • Vars
        • P(e);CHECK,N_GUARD::S(A),XQ(c)
      • Refutation
        • P(j);
    • Try
      • B(D);XP(j)
      • Threat
        • S(E)
      • Vars
        • R(k);N_GUARD::B(H)+P(G)
      • Refutation
        • P(e);CHECK
    • Try
      • B(H);
      • Threat
        • DUALS(2)
      • Vars
        • P(e);CHECK,N_GUARD::S(A),XQ(c)
        • P(j);OGATE::QAB(I)
      • Refutation
        • R(k);P_PINP(G),XB(H)
  • Actual
    • K(C);P-FLIGHT,P_SPINS(A)
    • Threat
      • QAR2(I),XP(h)
    • Vars
      • B(a);CHECK,OGATE,XS(A)::QAB1(I),XB(a)
      • Q(c);XP(B)::S(E),XQ(c)
      • P(j);OGATE::QAB(I)
      • R(k);N_GUARD::B(H)+P(G)
      • B(a);N_PINS(A)::S(A)
      • P(e);N_PINS(A)::S(A),XQ(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).