MESON Chess Problem Database

Problem Display
PID: 186679 (1B1R4/n3Npbq/4kp1p/7P/2N1rP2/4Q3/B7/K7 w - - 0 1)

Henry, S

Chess, 1960

1B1R4/n3Npbq/4kp1p/7P/2N1rP2/4Q3/B7/K7

#2

9 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Qg8
      • 2.Qxe4#
    • 1...Qh8
      • 2.Qxe4#
  • Tries
    • 1.Se5+?
      • 1...Rc4
        • 2.S5g6#
      • 1...Kxe7!
    • 1.Sf5?
      • threat
        • 2.Scd6#
        • 2.Qxe4#
      • 1...Kxf5
        • 2.Qh3#
      • 1...Rxe3
        • 2.Scxe3#
      • 1...Re5
        • 2.Scd6#
      • 1...Sc6
        • 2.Scd6#
      • 1...Qxf5!
    • 1.Qb6+?
      • 1...Kxe7
        • 2.Qd6#
      • 1...Sc6!
  • Keys
    • 1.Sg8!
      • threat
        • 2.Sd6#
      • 1...f5+
        • 2.Sb2#
      • 1...Kf5
        • 2.Qh3#
      • 1...Qxg8
        • 2.Qxe4#
      • 1...Rxe3
        • 2.Sxe3#
      • 1...Qf5
        • 2.Rd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • Q(h);N_GUARD::QAR2(C),XR(a)
  • Tries
    • Try
      • S(D);CHECK,N_PINR(a)
      • Vars
        • R(a);P_SPINR(a)::QAR(C)+S(D)
      • Refutation
        • K(b);P-FLIGHT,XS(G)
    • Try
      • S(G);
      • Threat
        • DUALS(2)
      • Vars
        • K(b);N_SPINR(a),OGATEB,S_FLIGHT,XS(G)::QAB(C)
        • R(a);N_SPINR(a),XQ(C)::B(B)+S(D),XR(a)
        • R(a);::B(B)+S(D)
        • S(e);::B(B)+S(D)
      • Refutation
        • Q(h);XS(G)
    • Try
      • Q(C);CHECK,N_PINR(a)
      • Vars
        • K(b);P-FLIGHT,XS(G)::QAB1(C)
      • Refutation
        • S(e);P_SPINS(e)
  • Actual
    • S(G);
    • Threat
      • B(B)+S(D)
    • Vars
      • P(c);CHECK,SBLOCK::B(B)+S(D)
      • K(b);N_SPINR(a),S_FLIGHT::QAB(C)
      • Q(h);N_GUARD,XS(G)::QAR2(C),XR(a)
      • R(a);N_SPINR(a),XQ(C)::B(B)+S(D),XR(a)
      • Q(h);SBLOCK::R1(I)
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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).