MESON Chess Problem Database

Problem Display
PID: 178704 (2b4n/1p1k1Bp1/1Pp3p1/4K1Bp/8/4pQp1/3p4/8 w - - 0 1)

Maleika, Gerhard

2nd Prize, Problem Observer Block-Threat Ty., 2009-2010

2b4n/1p1k1Bp1/1Pp3p1/4K1Bp/8/4pQp1/3p4/8

#2

5 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Sxf7+
      • 2.Qxf7#
    • 1...d1Q
      • 2.Qxd1#
    • 1...d1S
      • 2.Qxd1#
    • 1...d1B
      • 2.Qxd1#
    • 1...d1R
      • 2.Qxd1#
    • 1...e2
      • 2.Qd3#
    • 1...g2
      • 2.Qh3#
    • 1...h4
      • 2.Qg4#
    • 1...c5
      • 2.Qd5#
  • Tries
    • 1.Bh4?
      • 1...Sxf7+
        • 2.Qxf7#
      • 1...d1Q
        • 2.Qxd1#
      • 1...d1S
        • 2.Qxd1#
      • 1...d1B
        • 2.Qxd1#
      • 1...d1R
        • 2.Qxd1#
      • 1...e2
        • 2.Qd3#
      • 1...g2
        • 2.Qh3#
      • 1...c5
        • 2.Qd5#
      • 1...g5!
    • 1.Bxg6?
      • threat
        • 2.Qf5#
      • 1...Sf7+
        • 2.Qxf7#
      • 1...c5
        • 2.Qd5#
      • 1...Sxg6+!
    • 1.Qh1?
      • threat
        • 2.Qh3#
      • 1...d1Q
        • 2.Qxd1#
      • 1...d1B
        • 2.Qxd1#
      • 1...c5
        • 2.Qd5#
      • 1...Sxf7+!
    • 1.Qe2?
      • threat
        • 2.Qd3#
      • 1...c5
        • 2.Qb5#
      • 1...d1Q
        • 2.Qxd1#
      • 1...d1R
        • 2.Qxd1#
      • 1...Sxf7+!
    • 1.Qf6?
      • threat
        • 2.Qe7#
        • 2.Qd8#
        • 2.Qd6#
        • 2.Qe6#
      • 1...Sxf7+
        • 2.Qxf7#
      • 1...d1Q
        • 2.Qe7#
        • 2.Qd8#
        • 2.Qe6#
      • 1...d1R
        • 2.Qe7#
        • 2.Qd8#
        • 2.Qe6#
      • 1...c5
        • 2.Qd6#
        • 2.Qe6#
      • 1...gxf6+!
  • Keys
    • 1.Qf1!
      • threat
        • 2.Qd3#
        • 2.Qh3#
      • 1...Sxf7+
        • 2.Qxf7#
      • 1...c5
        • 2.Qb5#
      • 1...d1Q
        • 2.Qxd1#
      • 1...d1B
        • 2.Qd3#
        • 2.Qxd1#
      • 1...d1R
        • 2.Qh3#
        • 2.Qxd1#
      • 1...e2
        • 2.Qh3#
      • 1...g2
        • 2.Qd3#

FEATURES

  • Static
    • TYPE = BLOCK_THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 0
    • REMOVED MATES = 4
  • Sets
    • S(k);CHECK,OGATE,XB(E)::QAR2(A),XS(k)
    • P(a);OGATEB::QAR(A),XQ(a)
    • P(a);OGATEB::QAR(A),XS(a)
    • P(a);OGATEB::QAR(A),XB(a)
    • P(a);OGATEB::QAR(A),XR(a)
    • P(b);OGATE::QAR(A)
    • P(c);OGATE::QAB(A)
    • P(d);N_GUARD::QAB(A)
    • P(e);N_GUARD::QAR2(A)
  • Tries
    • Try
      • B(C);
      • Vars
        • S(k);CHECK,OGATE,XB(E)::QAR2(A),XS(k)
        • P(a);OGATEB::QAR(A),XQ(a)
        • P(a);OGATEB::QAR(A),XS(a)
        • P(a);OGATEB::QAR(A),XB(a)
        • P(a);OGATEB::QAR(A),XR(a)
        • P(b);OGATE::QAR(A)
        • P(c);OGATE::QAB(A)
        • P(e);N_GUARD::QAR2(A)
      • Refutation
        • P(f);
    • Try
      • B(E);XP(f)
      • Threat
        • QAB(A)
      • Vars
        • S(k);CHECK,N_GUARD::QAR2(A),XS(k)
        • P(e);N_GUARD::QAR2(A)
      • Refutation
        • S(k);CHECK,XB(E)
    • Try
      • Q(A);
      • Threat
        • QAB(A)
      • Vars
        • P(a);OGATEB::QAR(A),XQ(a)
        • P(a);OGATEB::QAR(A),XB(a)
        • P(e);N_GUARD::QAR2(A)
      • Refutation
        • S(k);CHECK,XB(E)
    • Try
      • Q(A);
      • Threat
        • QAR(A)
      • Vars
        • P(e);OGATEB::QAB(A)
        • P(a);OGATEB::QAR(A),XQ(a)
        • P(a);OGATEB::QAR(A),XR(a)
      • Refutation
        • S(k);CHECK,XB(E)
    • Try
      • Q(A);
      • Threat
        • DUALS(4)
      • Vars
        • S(k);CHECK,OGATE,XB(E)::QAR2(A),XS(k)
      • Refutation
        • P(i);CHECK,XQ(A)
  • Actual
    • Q(A);
    • Threat
      • DUALS(2)
    • Vars
      • S(k);CHECK,OGATE,XB(E)::QAR2(A),XS(k)
      • P(e);OGATEB::QAB(A)
      • P(a);OGATEB::QAR(A),XQ(a)
      • P(b);::QAB(A)
      • P(c);::QAR(A)
HTML5 logo

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).