MESON Chess Problem Database

Problem Display
PID: 208023 (8/1Kp5/4Pp2/5b1R/4k3/pN2n1P1/PrR1P3/BB4Q1 w - - 0 1)

Willis, J

Australasian (The), 1873

8/1Kp5/4Pp2/5b1R/4k3/pN2n1P1/PrR1P3/BB4Q1

#2

11 + 7

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Bh3
      • 2.Rc4#
    • 1...Bg4
      • 2.Rc4#
    • 1...Bxe6
      • 2.Rc4#
    • 1...Bg6
      • 2.Rc4#
    • 1...Bh7
      • 2.Rc4#
    • 1...Sd1
      • 2.Qd4#
    • 1...Sf1
      • 2.Qd4#
    • 1...Sxc2
      • 2.Qd4#
    • 1...Sg2
      • 2.Qd4#
    • 1...Sc4
      • 2.Qd4#
    • 1...Sg4
      • 2.Qd4#
    • 1...Sd5
      • 2.Qd4#
  • Tries
    • 1.Rd2+?
      • 1...Ke5
        • 2.Qxe3#
      • 1...Rc2
        • 2.Sc5#
      • 1...Sc2
        • 2.Qd4#
      • 1...Rxb1!
    • 1.Rc5+?
      • 1...Rc2
        • 2.Sd2#
      • 1...Sc2
        • 2.Qd4#
      • 1...Rxb1!
  • Keys
    • 1.Kc6!
      • 1...Rxc2+
        • 2.Sc5#
      • 1...Ke5
        • 2.Qxe3#
      • 1...Rxb1
        • 2.Sd2#
        • 2.Sc5#
      • 1...Rxa2
        • 2.Sd2#
        • 2.Sc5#
        • 2.Rc4#
      • 1...Rxb3
        • 2.Rc4#
      • 1...Bxe6
        • 2.Rc4#
      • 1...Sxc2
        • 2.Qd4#
      • 1...Bh3
        • 2.Rc4#
      • 1...Bg4
        • 2.Rc4#
      • 1...Bg6
        • 2.Rc4#
      • 1...Bh7
        • 2.Rc4#
      • 1...Sd1
        • 2.Qd4#
      • 1...Sf1
        • 2.Qd4#
      • 1...Sg2
        • 2.Qd4#
      • 1...Sc4
        • 2.Qd4#
      • 1...Sg4
        • 2.Qd4#
      • 1...Sd5
        • 2.Qd4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • B(e);::B(B)+R(E),DCHECK
    • B(e);XP(J)::B(B)+R(E),DCHECK
    • S(c);OGATE::QAR1(C)
    • S(c);OGATE,P_SPINS(c),XR(E)::QAR1(C)
  • Tries
    • Try
      • R(E);CHECK
      • Vars
        • K(d);P-FLIGHT,P_SPINB(e),P_SPINR(a)::QAR2(C),XS(c)
        • R(a);N_PINS(G),P_SPINR(a)::S(G)
        • S(c);OGATE,P_SPINS(c)::QAR1(C)
      • Refutation
        • R(a);XB(B)
    • Try
      • R(E);CHECK
      • Vars
        • R(a);N_PINS(G),P_SPINR(a)::S(G)
        • S(c);OGATE,P_SPINS(c)::QAR1(C)
      • Refutation
        • R(a);XB(B)
  • Actual
    • K(K);N_SPINS(G),S_FLIGHT
    • Vars
      • R(a);CHECK,P_SPINR(a),XR(E)::S(G)
      • K(d);P-FLIGHT,P_SPINB(e),P_SPINR(a)::QAR2(C),XS(c)
      • R(a);XS(G)::B(B)+R(E),DCHECK
      • B(e);XP(J)::B(B)+R(E),DCHECK
      • S(c);OGATE,P_SPINS(c),XR(E)::QAR1(C)
      • B(e);::B(B)+R(E),DCHECK
      • S(c);OGATE::QAR1(C)
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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).