MESON Chess Problem Database

Problem Display
PID: 139904 (b7/8/1R5q/6r1/pN1BN1Pn/P6R/p7/rkb1Q2K w - - 0 1)

Boorer, PA

The Problemist, 1938

b7/8/1R5q/6r1/pN1BN1Pn/P6R/p7/rkb1Q2K

#2

9 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Bxe4+
      • 2.Qxe4#
    • 1...Sg2
      • 2.Sd2#
  • Tries
    • 1.Sd5+?
      • 1...Kc2
        • 2.Rc3#
      • 1...Qxb6!
    • 1.Sc6+?
      • 1...Kc2
        • 2.Rc3#
      • 1...Rb5!
    • 1.Qc3?
      • threat
        • 2.Qxa1#
        • 2.Qc2#
        • 2.Qd3#
      • 1...Bxa3
        • 2.Qxa1#
        • 2.Qc2#
      • 1...Qc6
        • 2.Qxa1#
      • 1...Rc5
        • 2.Qxa1#
      • 1...Bb2
        • 2.Qxb2#
        • 2.Qc2#
      • 1...Bd2
        • 2.Qxa1#
        • 2.Qb2#
        • 2.Qc2#
      • 1...Be3
        • 2.Qxa1#
        • 2.Qb2#
        • 2.Qc2#
      • 1...Bf4
        • 2.Qxa1#
        • 2.Qb2#
        • 2.Qc2#
      • 1...Bxe4+!
  • Keys
    • 1.Rh2!
      • threat
        • 2.Rb2#
      • 1...Bxe4+
        • 2.Qxe4#
      • 1...Sg2
        • 2.Sd2#
      • 1...Sf3
        • 2.Sc3#
      • 1...Sf5
        • 2.Sc6#
      • 1...Sg6
        • 2.Sd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • B(i);CHECK,OGATE,XS(G)::QAB(A),XB(i)
    • S(f);N_PINS(G),P_PINR(D)::S(G)
  • Tries
    • Try
      • S(E);CHECK,N_SPINS(G)
      • Vars
        • K(b);N_SPINB(c),S_FLIGHT::R1(D)
      • Refutation
        • Q(h);XR(I)
    • Try
      • S(E);CHECK,N_SPINS(G)
      • Vars
        • K(b);N_SPINB(c),S_FLIGHT::R1(D)
      • Refutation
        • R(g);P_SPINR(g)
    • Try
      • Q(A);N_PINB(c)
      • Threat
        • DUALS(3)
      • Vars
        • Q(h);::QAR1(A),XR(a)
        • R(g);::QAR1(A),XR(a)
      • Refutation
        • B(i);CHECK,XS(G)
  • Actual
    • R(D);
    • Threat
      • R1(D)
    • Vars
      • B(i);CHECK,OGATE,XS(G)::QAB(A),XB(i)
      • S(f);N_PINS(G),P_PINR(D)::S(G)
      • S(f);P_PINR(D),S_CUTR(g)::R(I)+S(E)
      • S(f);P_PINR(D),S_CUTQ(h)::R(I)+S(E)
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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).