MESON Chess Problem Database

Problem Display
PID: 87654 (N7/1p1p1K2/1p1k2p1/5p2/2PPBRp1/3Q4/2n5/8 w - - 0 1)

Michael, John

The Problemist, 1991

N7/1p1p1K2/1p1k2p1/5p2/2PPBRp1/3Q4/2n5/8

#2

7 + 8

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Sa1
      • 2.Qa3#
    • 1...Se1
      • 2.Qa3#
    • 1...Sa3
      • 2.Qxa3#
    • 1...Se3
      • 2.Qa3#
    • 1...Sxd4
      • 2.Qxd4#
    • 1...fxe4
      • 2.Rf6#
    • 1...b5
      • 2.c5#
  • Tries
    • 1.Rxg4?
      • threat
        • 2.Rxg6#
      • 1...Sxd4
        • 2.Qxd4#
      • 1...fxg4
        • 2.Qg3#
      • 1...g5!
    • 1.Rxf5?
      • threat
        • 2.Rf6#
        • 2.Qg3#
      • 1...Sxd4
        • 2.Qa3#
        • 2.Qg3#
        • 2.Qxd4#
      • 1...Se3
        • 2.Rf6#
        • 2.Qa3#
      • 1...g3
        • 2.Rf6#
        • 2.Qxg3#
      • 1...gxf5!
    • 1.Qa3+?
      • 1...Sb4
        • 2.Qxb4#
      • 1...Sxa3!
    • 1.Qb3?
      • threat
        • 2.Qxb6#
      • 1...Sb4
        • 2.Qxb4#
      • 1...b5
        • 2.c5#
      • 1...Sxd4!
  • Keys
    • 1.Qg3!
      • threat
        • 2.Rxf5#
      • 1...fxe4
        • 2.Rf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 6
  • Sets
    • S(a);N_GUARD::QAB(A)
    • S(a);N_GUARD::QAB(A),XS(a)
    • S(a);OGATE,P_SPINS(a),XP(C)::QAR2(A),XS(a)
    • P(c);OGATE,XB(D)::R(E)
    • P(d);N_GUARD::P(B)
  • Tries
    • Try
      • R(E);XP(b)
      • Threat
        • R(E),XP(f)
      • Vars
        • S(a);OGATE,P_SPINS(a),XP(C)::QAR2(A),XS(a)
        • P(c);N_GUARD,XR(E)::QAB(A)
      • Refutation
        • P(f);
    • Try
      • R(E);XP(c)
      • Threat
        • DUALS(2)
      • Refutation
        • P(f);XR(E)
    • Try
      • Q(A);CHECK
      • Vars
        • S(a);N_GUARD,P_SPINS(a)::QAB(A),XS(a)
      • Refutation
        • S(a);XQ(A)
    • Try
      • Q(A);
      • Threat
        • QAR2(A),XP(d)
      • Vars
        • S(a);N_GUARD::QAB(A),XS(a)
        • P(d);N_GUARD::P(B)
      • Refutation
        • S(a);XP(C)
  • Actual
    • Q(A);
    • Threat
      • QAB(A)+R(E),XP(c)
    • Vars
      • P(c);OGATE,XB(D)::QAB(A)+R(E),DCHECK
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).