MESON Chess Problem Database

Problem Display
PID: 216255 (8/1Q6/2qnr3/1bR2p2/N3kPn1/2P3R1/6N1/4K2B w - - 0 1)

Gray, Alexander

Australasian (The), 1881

8/1Q6/2qnr3/1bR2p2/N3kPn1/2P3R1/6N1/4K2B

#2

9 + 7

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qd5
      • 2.Qxd5#
    • 1...Bf1
      • 2.Qxc6#
    • 1...Be2
      • 2.Qxc6#
    • 1...Bd3
      • 2.Qxc6#
    • 1...Ba6
      • 2.Qxc6#
    • 1...Sf2
      • 2.Re3#
    • 1...Sh2
      • 2.Re3#
    • 1...Se3
      • 2.Rxe3#
    • 1...Se5
      • 2.Re3#
    • 1...Sf6
      • 2.Re3#
    • 1...Sh6
      • 2.Re3#
  • Tries
    • 1.Se3+?
      • 1...Kd3
        • 2.Sb2#
      • 1...Kxf4!
  • Keys
    • 1.Rd5!
      • threat
        • 2.Rd4#
      • 1...Kxd5+
        • 2.Se3#
      • 1...Qxc3+
        • 2.Sxc3#
      • 1...Qxd5
        • 2.Sc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 10
  • Sets
    • Q(e);OGATE::QAB1(I),XQ(e)
    • B(c);N_GUARD::QAB(I),XQ(e)
    • S(b);N_GUARD::R1(E)
    • S(b);N_GUARD::R1(E),XS(b)
  • Tries
    • Try
      • S(C);CHECK
      • Vars
        • K(a);N_SPINQ(e),P_PINS(C),S_FLIGHT::S(F)
      • Refutation
        • K(a);N_SPINQ(e),P-FLIGHT,P_PINS(C),XP(G)
  • Actual
    • R(H);N_PINQ(e)
    • Threat
      • R1(H)
    • Vars
      • K(a);CHECK,P_SPINQ(e),S_FLIGHT,XR(H)::B(B)+S(C),DCHECK
      • Q(e);CHECK,XP(D)::S(F),XQ(e)
      • Q(e);N_GUARD,P_SPINQ(e),XR(H)::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).