MESON Chess Problem Database

Problem Display
PID: 11168 (n7/3B1n2/R3pN2/p1kpQb1R/pr3p1K/B4P1p/1N6/2r5 w - - 0 1)

Boorer, PA

Chess, 1937

n7/3B1n2/R3pN2/p1kpQb1R/pr3p1K/B4P1p/1N6/2r5

#2

9 + 12

SOLUTION

  • SOUND
  • Sets
    • 1...Ra1
      • 2.Qc3#
    • 1...Rb1
      • 2.Qc3#
    • 1...Rd1
      • 2.Qc3#
    • 1...Re1
      • 2.Qc3#
    • 1...Rf1
      • 2.Qc3#
    • 1...Rg1
      • 2.Qc3#
    • 1...Rh1
      • 2.Qc3#
    • 1...Rc3
      • 2.Qxc3#
    • 1...Rc4
      • 2.Sxa4#
    • 1...Bc2
      • 2.Qc3#
    • 1...Be4
      • 2.Sxe4#
    • 1...Bg4
      • 2.Se4#
    • 1...Sb6
      • 2.Rxa5#
  • Tries
    • 1.Bxa4?
      • threat
        • 2.Sd7#
        • 2.Rc6#
      • 1...Sd8
        • 2.Sd7#
      • 1...Sb6
        • 2.Rxa5#
      • 1...Sxe5!
    • 1.Qe3+?
      • 1...d4
        • 2.Qxc1#
      • 1...fxe3+!
  • Keys
    • 1.Qxf4!
      • threat
        • 2.Sxa4#
      • 1...Be4
        • 2.Qe3#
      • 1...Bc2
        • 2.Qc4#
      • 1...Sb6
        • 2.Rxa5#
      • 1...d4
        • 2.Qxc1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 10
  • Sets
    • R(a);N_GUARD::QAR2(E)
    • R(a);N_GUARD::QAR2(E),XR(a)
    • R(a);SBLOCK::S(A),XP(c)
    • B(i);S_CUTR(a)::QAR2(E)
    • B(i);N_GUARD::S(H),XB(i)
    • B(i);N_GUARD::S(H)
    • S(l);SBLOCK::R(G),XP(f)
  • Tries
    • Try
      • B(I);XP(c)
      • Threat
        • DUALS(2)
      • Vars
        • S(k);::S(H)
        • S(l);SBLOCK::R(G),XP(f)
      • Refutation
        • S(k);N_SPINP(h),XQ(E)
    • Try
      • Q(E);CHECK,N_PINP(h)
      • Vars
        • P(h);P_SPINB(i),P_SPINP(h),SBLOCK::QAR(E),XR(a)
      • Refutation
        • P(e);CHECK,XQ(E)
  • Actual
    • Q(E);N_PINP(h),P_SPINQ(E),XP(e)
    • Threat
      • S(A),XP(c)
    • Vars
      • B(i);N_PINQ(E),P_SPINP(h)::QAB(E)
      • B(i);P_SPINP(h),S_CUTR(a)::QAR1(E)
      • S(l);SBLOCK::R(G),XP(f)
      • P(h);N_PINQ(E),P_SPINB(i),SBLOCK::QAR(E),XR(a)
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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).