MESON Chess Problem Database

Problem Display
PID: 45373 (B3R3/4B2Q/1p3P2/3b1r1r/1K1k1P2/3N1p2/5P2/2R1N3 w - - 0 1)

Stevenson, Edward

Double Pin-Mate after a Black King Move, 1980

B3R3/4B2Q/1p3P2/3b1r1r/1K1k1P2/3N1p2/5P2/2R1N3

#2

11 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Ke4
      • 2.Bc5#
      • 2.Rc4#
    • 1...Rxf4
      • 2.Sc2#
    • 1...Re5
      • 2.Sc2#
    • 1...Rfg5
      • 2.Sc2#
    • 1...Rxf6
      • 2.Sc2#
    • 1...Bc4
      • 2.Rxc4#
    • 1...Be4
      • 2.Rc4#
    • 1...b5
      • 2.Bc5#
  • Tries
    • 1.Sc5?
      • threat
        • 2.Sc2#
        • 2.Rd1#
      • 1...bxc5+
        • 2.Bxc5#
      • 1...Bxa8
        • 2.Rd1#
      • 1...Bc6
        • 2.Rd1#
      • 1...Bb7
        • 2.Rd1#
      • 1...Bb3
        • 2.Sxf3#
        • 2.Sxb3#
      • 1...Bc4
        • 2.Sc2#
        • 2.Sxf3#
        • 2.Rxc4#
      • 1...Be4
        • 2.Sb3#
        • 2.Se6#
        • 2.Rc4#
      • 1...Rxf4!
    • 1.Rd8?
      • threat
        • 2.Rc4#
      • 1...Ke4
        • 2.Rc4#
      • 1...b5!
    • 1.Qxf5?
      • threat
        • 2.Sc2#
      • 1...Bb3
        • 2.Sxf3#
        • 2.Qe4#
      • 1...Be4
        • 2.Rc4#
        • 2.Qxe4#
      • 1...Rxf5!
  • Keys
    • 1.Rd1!
      • threat
        • 2.Sc5#
      • 1...Ke4
        • 2.Bc5#
      • 1...Rxf4
        • 2.Sc2#
      • 1...Bb3
        • 2.Sxf3#
      • 1...Bc4
        • 2.Sc2#
        • 2.Sxf3#
      • 1...Be4
        • 2.Sc2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 5
  • Sets
    • R(d);XP(F)::S(B)
    • R(d);::S(B)
    • R(d);XP(G)::S(B)
    • B(c);N_GUARD::R1(A),XB(c)
    • B(c);N_GUARD::R1(A)
    • P(f);N_GUARD::B(H)
  • Tries
    • Try
      • S(D);
      • Threat
        • DUALS(2)
      • Vars
        • P(f);CHECK,OGATE,XS(D)::B(H),XP(f)
        • B(c);XB(J)::R(A)
        • B(c);::R(A)
      • Refutation
        • R(d);XP(F)
    • Try
      • R(K);P_PINB(c)
      • Threat
        • R1(A)
      • Vars
        • K(b);P-FLIGHT,P_SPINR(d)::R(A)
      • Refutation
        • P(f);
    • Try
      • Q(I);XR(d)
      • Threat
        • S(B)
      • Refutation
        • R(e);XQ(I)
  • Actual
    • R(A);
    • Threat
      • R(A)+S(D)
    • Vars
      • K(b);P-FLIGHT,P_SPINB(c),P_SPINR(d)::R(K)+B(H)
      • R(d);XP(F)::S(B)
      • B(c);N_GUARD::S(B),XP(a)
      • B(c);::S(B)
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).