MESON Chess Problem Database

Problem Display
PID: 45473 (5r2/R2pB3/1p2p3/Nkn1n2R/bN6/Q3P3/3pKp2/3rbB2 w - - 0 1)

Packer, GFH

2nd HM., BCF 051. Ty., 1945-1946

5r2/R2pB3/1p2p3/Nkn1n2R/bN6/Q3P3/3pKp2/3rbB2

#2

9 + 12

SOLUTION

  • SOUND
  • Sets
    • 1...Sb3
      • 2.Kxd1#
    • 1...Scd3
      • 2.Qxd3#
    • 1...Se4
      • 2.Qd3#
    • 1...Sb7
      • 2.Qd3#
    • 1...Sf7
      • 2.Kf3#
  • Tries
    • 1.Sa2?
      • threat
        • 2.Sc3#
        • 2.Qb4#
      • 1...bxa5
        • 2.Qxc5#
      • 1...Rb1
        • 2.Sc3#
      • 1...Rc1
        • 2.Qb4#
      • 1...Rf4
        • 2.Sc3#
      • 1...Scd3
        • 2.Sc3#
        • 2.Qxd3#
      • 1...Se4
        • 2.Qb4#
        • 2.Qd3#
      • 1...Sed3
        • 2.Sc3#
        • 2.Qxd3#
      • 1...Sc6
        • 2.Sc3#
        • 2.Qd3#
      • 1...Sa6!
    • 1.Sa6?
      • threat
        • 2.Sc7#
        • 2.Qb4#
      • 1...Kxa5
        • 2.Qb4#
      • 1...bxa5
        • 2.Qxc5#
      • 1...Rb1
        • 2.Sc7#
      • 1...Rf4
        • 2.Sc7#
      • 1...Rc8
        • 2.Qb4#
      • 1...Scd3
        • 2.Sc7#
      • 1...Sed3
        • 2.Sc7#
      • 1...Sc6
        • 2.Sc7#
      • 1...Sxa6!
    • 1.Qxa4+?
      • 1...Sxa4
        • 2.Kxd1#
      • 1...Kxa4!
  • Keys
    • 1.Sb7!
      • threat
        • 2.Sd6#
      • 1...Kc4
        • 2.Sd6#
      • 1...Sxb7
        • 2.Qd3#
      • 1...Sb3
        • 2.Kxd1#
      • 1...Scd3
        • 2.Qxd3#
      • 1...Se4
        • 2.Qd3#
      • 1...Sa6
        • 2.Qd3#
      • 1...Sc4
        • 2.Qxa4#
      • 1...Sf7
        • 2.Kf3#
      • 1...d6
        • 2.Sxd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • S(g);P_SPINS(h)::B(A)+K(B),XR(a)
    • S(g);N_GUARD,P_SPINS(h)::QAB(C),XS(g)
    • S(g);N_GUARD,P_SPINS(h)::QAB(C)
    • S(h);P_SPINS(g)::B(A)+K(B)
  • Tries
    • Try
      • S(E);
      • Threat
        • DUALS(2)
      • Vars
        • P(i);N_GUARD,XS(F)::QAR1(C),XS(g)
        • R(a);::S(E)
        • R(a);::QAR1(C)
        • R(l);::S(E)
      • Refutation
        • S(g);P_SPINS(h)
    • Try
      • S(E);
      • Threat
        • DUALS(2)
      • Vars
        • K(f);P-FLIGHT,P_SPINB(e),XS(F)::QAB1(C)
        • P(i);N_GUARD,SBLOCK,XS(F)::QAR1(C),XS(g)
        • R(a);::S(E)
        • R(l);::S(E)
        • R(l);::QAR1(C)
        • S(g);P_SPINS(h)::S(E)
        • S(h);P_SPINS(g)::S(E)
      • Refutation
        • S(g);P_SPINS(h),XS(E)
    • Try
      • Q(C);CHECK,XB(e)
      • Vars
        • S(g);P_SPINS(h),SBLOCK,XQ(C)::B(A)+K(B),XR(a)
      • Refutation
        • K(f);S_FLIGHT,XQ(C)
  • Actual
    • S(F);
    • Threat
      • S(F)
    • Vars
      • K(f);S_FLIGHT::S(F)
      • S(g);N_GUARD,P_SPINS(h),XS(F)::QAB(C)
      • S(g);P_SPINS(h)::B(A)+K(B),XR(a)
      • S(g);N_GUARD,P_SPINS(h)::QAB(C),XS(g)
      • S(g);N_GUARD,P_SPINS(h)::QAB(C)
      • S(h);P_SPINS(g),SBLOCK::QAB1(C),XB(e)
      • S(h);P_SPINS(g)::B(A)+K(B)
      • P(k);::S(F),XP(k)
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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).