MESON Chess Problem Database

Problem Display
PID: 206485 (1b2NQK1/6p1/n1p3p1/Rn1k4/4Rp2/2rp2r1/2N5/7B w - - 0 1)

Opdenoordt, Joseph J

De Maasbode, 1925

1b2NQK1/6p1/n1p3p1/Rn1k4/4Rp2/2rp2r1/2N5/7B

#2

7 + 11

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Rc5
      • 2.Qf7#
    • 1...Bd6
      • 2.Qxd6#
    • 1...Ba7
      • 2.Qd6#
    • 1...Sb4
      • 2.Sxb4#
    • 1...Sc5
      • 2.Sb4#
    • 1...Sc7
      • 2.Sb4#
      • 2.Qd6#
  • Tries
    • 1.Sc7+?
      • 1...Sxc7
        • 2.Sb4#
      • 1...Bxc7!
    • 1.Re5+?
      • 1...Kc4
        • 2.Qf7#
      • 1...Kxe5!
    • 1.Qf5+?
      • 1...Be5
        • 2.Qxe5#
      • 1...gxf5!
    • 1.Qf6?
      • threat
        • 2.Qd4#
      • 1...Kc5
        • 2.Qd4#
      • 1...Rc4
        • 2.Re5#
      • 1...Rc5
        • 2.Rd4#
        • 2.Qe6#
        • 2.Qf7#
      • 1...Be5
        • 2.Qxe5#
      • 1...Ba7
        • 2.Qe5#
        • 2.Qd6#
      • 1...Sc5
        • 2.Sb4#
        • 2.Rd4#
      • 1...c5
        • 2.Rd4#
        • 2.Qe6#
      • 1...gxf6!
  • Keys
    • 1.Qxg7!
      • threat
        • 2.Qd4#
      • 1...Kc5
        • 2.Qd4#
      • 1...Be5
        • 2.Qxe5#
      • 1...Rc4
        • 2.Re5#
      • 1...Rc5
        • 2.Qf7#
      • 1...Ba7
        • 2.Qe5#
      • 1...Sc5
        • 2.Sb4#
      • 1...c5
        • 2.Qb7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 2
  • Sets
    • R(a);N_SPINS(e),SBLOCK::QAB(F)
    • B(k);N_GUARD::QAR1(F),XB(k)
    • B(k);N_GUARD::QAR1(F)
    • S(g);N_GUARD::S(B),XS(g)
    • S(g);N_GUARD,N_SPINS(e)::S(B)
  • Tries
    • Try
      • S(E);CHECK
      • Vars
        • S(g);XS(E)::S(B)
      • Refutation
        • B(k);XS(E)
    • Try
      • R(C);CHECK
      • Vars
        • K(f);N_SPINS(e),S_FLIGHT::QAB(F)
      • Refutation
        • K(f);P-FLIGHT,XR(C)
    • Try
      • Q(F);CHECK
      • Vars
        • B(k);N_GUARD,P_SPINB(k)::QAR1(F),XB(k)
      • Refutation
        • P(i);XQ(F)
    • Try
      • Q(F);
      • Threat
        • QAR1(F)
      • Vars
        • K(f);P-FLIGHT::QAB1(F)
        • R(a);SBLOCK::B(A)+R(C),DCHECK
        • B(k);N_GUARD::QAR1(F),XB(k)
      • Refutation
        • P(j);XQ(F)
  • Actual
    • Q(F);XP(j)
    • Threat
      • QAR1(F)
    • Vars
      • K(f);P-FLIGHT::QAB1(F)
      • B(k);N_GUARD::QAR1(F),XB(k)
      • R(a);SBLOCK::B(A)+R(C),DCHECK
      • R(a);N_SPINS(e),SBLOCK::QAB(F)
      • B(k);N_GUARD::QAR1(F)
      • S(g);N_GUARD,N_SPINS(e),SBLOCK::S(B)
      • P(h);N_SPINS(e),OGATEB,SBLOCK::QAB(F)
HTML5 logo

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).