MESON Chess Problem Database

Problem Display
PID: 207117 (8/4rp2/3p1N2/4k3/Q4NK1/3P4/1b1n4/6B1 w - - 0 1)

Healey, Frank

A Collection of Two Hundred Chess Problems (Healey), 1866

8/4rp2/3p1N2/4k3/Q4NK1/3P4/1b1n4/6B1

#2

6 + 6

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Re6
      • 2.Sd7#
    • 1...Rd7
      • 2.Sxd7#
    • 1...Re8
      • 2.Sd7#
    • 1...Ba1
      • 2.Qxa1#
    • 1...Bc1
      • 2.Bd4#
      • 2.Qd4#
    • 1...Ba3
      • 2.Bd4#
      • 2.Qd4#
    • 1...Bd4
      • 2.Bxd4#
      • 2.Qxd4#
  • Tries
    • 1.Qb5+?
      • 1...Kxf6
        • 2.Qg5#
      • 1...d5!
    • 1.Qe4+?
      • 1...Kxf6
        • 2.Sh5#
      • 1...Sxe4!
    • 1.Qa5+?
      • 1...Kxf6
        • 2.Qg5#
      • 1...d5!
    • 1.d4+?
      • 1...Bxd4
        • 2.Bxd4#
        • 2.Qxd4#
      • 1...Kxf6!
  • Keys
    • 1.Qe8!
      • threat
        • 2.Sd7#
        • 2.Qxe7#
      • 1...Kxf6
        • 2.Qh8#
      • 1...Rxe8
        • 2.Sd7#
      • 1...d5
        • 2.Qxe7#
      • 1...Re6
        • 2.Sd7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • R(e);N_GUARD::S(F)
    • R(e);N_GUARD::S(F),XR(e)
    • B(a);OGATEB::QAB(C),XB(a)
  • Tries
    • Try
      • Q(C);CHECK
      • Vars
        • K(c);OGATE,S_FLIGHT,XS(F)::QAB1(C)
      • Refutation
        • P(d);P_SPINP(d)
    • Try
      • Q(C);CHECK
      • Vars
        • K(c);S_FLIGHT,XS(F)::S(D)
      • Refutation
        • S(b);XQ(C)
    • Try
      • Q(C);CHECK
      • Vars
        • K(c);OGATE,S_FLIGHT,XS(F)::QAB1(C)
      • Refutation
        • P(d);P_SPINP(d)
    • Try
      • P(B);CHECK
      • Refutation
        • K(c);S_FLIGHT,XS(F)
  • Actual
    • Q(C);P_PINR(e)
    • Threat
      • DUALS(2)
    • Vars
      • K(c);N_SPINR(e),OGATEB,S_FLIGHT,XS(F)::QAB(C)
      • R(e);N_SPINR(e),XQ(C)::S(F)
      • P(d);::QAR2(C),XR(e)
      • R(e);::S(F)
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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).