MESON Chess Problem Database

Problem Display
PID: 203024 (5n1B/1B1Q4/3p4/1p1rNKp1/p2k1b1R/2R2P2/1PpN4/3b4 w - - 0 1)

Draper, H Jack

The Problemist, 1983

5n1B/1B1Q4/3p4/1p1rNKp1/p2k1b1R/2R2P2/1PpN4/3b4

#2

10 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Rc5
      • 2.Rd3#
    • 1...Rxe5+
      • 2.Bxe5#
    • 1...Bxf3
      • 2.Sxf3#
    • 1...a3
      • 2.Sb3#
    • 1...dxe5
      • 2.Bxe5#
      • 2.Qxd5#
  • Tries
    • 1.Qc6?
      • threat
        • 2.Rd3#
        • 2.Qxd5#
      • 1...Bxf3
        • 2.Sxf3#
        • 2.Rd3#
      • 1...dxe5
        • 2.Qxd5#
      • 1...c1S
        • 2.Qxd5#
      • 1...Rc5
        • 2.Rd3#
        • 2.Qe4#
      • 1...Be2
        • 2.Qxd5#
      • 1...Rxe5+!
    • 1.Qxd6?
      • threat
        • 2.Rd3#
        • 2.Qb4#
        • 2.Qxd5#
      • 1...Bxf3
        • 2.Sxf3#
        • 2.Rd3#
        • 2.Qb4#
      • 1...c1S
        • 2.Qb4#
        • 2.Qxd5#
      • 1...Be2
        • 2.Qxd5#
      • 1...b4
        • 2.Rd3#
        • 2.Qxb4#
        • 2.Qxd5#
      • 1...Rxd6!
  • Keys
    • 1.Kg4!
      • threat
        • 2.Sc6#
      • 1...Bxf3+
        • 2.Sexf3#
      • 1...Rxe5
        • 2.Qxd6#
      • 1...Bxe5
        • 2.Kxg5#
      • 1...dxe5
        • 2.Qxd5#
      • 1...Rc5
        • 2.Rd3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • R(g);P_SPINP(i),SBLOCK::R1(C)
    • R(g);CHECK,OGATE,P_SPINP(i),P_SPINR(g),XS(F)::B(J),XR(g)
    • B(a);XP(D)::S(B),XB(a)
    • P(c);N_GUARD::S(B)
  • Tries
    • Try
      • Q(I);
      • Threat
        • DUALS(2)
      • Vars
        • P(i);P_SPINP(i),XS(F)::QAR1(I),XR(g)
        • P(b);::QAR1(I),XR(g)
        • B(a);::QAR1(I),XR(g)
      • Refutation
        • R(g);CHECK,P_SPINR(g),XS(F)
    • Try
      • Q(I);P_PINR(g),XP(i)
      • Threat
        • DUALS(3)
      • Vars
        • B(a);::QAR1(I),XR(g)
      • Refutation
        • R(g);N_PINS(F),N_SPINR(g),XQ(I)
  • Actual
    • K(G);N_PINB(e),N_SPINS(F),P_SPINP(D),S_FLIGHT
    • Threat
      • B(J)+S(F),DCHECK
    • Vars
      • B(a);CHECK,XP(D)::B(J)+S(F),DCHECK,XB(a)
      • R(g);OGATEB,P_SPINP(i),P_SPINR(g),XS(F)::QAR2(I),XP(i)
      • B(e);P_SPINB(e),XS(F)::R(E)+K(G),XP(h)
      • P(i);OGATE,P_SPINP(i),P_SPINR(g),XS(F)::QAR1(I),XR(g)
      • R(g);P_SPINP(i),SBLOCK::R1(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).