MESON Chess Problem Database

Problem Display
PID: 249767 (R3B3/BnP1pp1p/3P1p2/bN3p1q/k1KQ2r1/P3R2P/8/8 w - - 0 1)

Lindgren, Bo Waldemar

Stella Polaris, 1969

R3B3/BnP1pp1p/3P1p2/bN3p1q/k1KQ2r1/P3R2P/8/8

#2

11 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Rxd4+
      • 2.Sxd4#
    • 1...Sxd6+
      • 2.Sxd6#
    • 1...f4
      • 2.Qd1#
    • 1...exd6
      • 2.Sxd6#
  • Tries
    • 1.Kd5+?
      • 1...Rxd4+
        • 2.Sxd4#
      • 1...Bb4!
    • 1.Bc5?
      • threat
        • 2.Sc3#
        • 2.Sa7#
      • 1...Rxd4+
        • 2.Sxd4#
      • 1...Sxd6+
        • 2.Sxd6#
      • 1...Rg8
        • 2.Kd5#
        • 2.Sc3#
      • 1...Sd8
        • 2.Sc3#
      • 1...Sxc5!
  • Keys
    • 1.Bb6!
      • threat
        • 2.Sa7#
      • 1...Rxd4+
        • 2.Sxd4#
      • 1...Sxd6+
        • 2.Sxd6#
      • 1...Rg8
        • 2.Kd5#
      • 1...Sc5
        • 2.Rxa5#
      • 1...Sd8
        • 2.Rxa5#
      • 1...f4
        • 2.Qd1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • R(b);CHECK,XQ(E)::B(K)+S(F),XR(b)
    • S(g);CHECK,XP(G)::B(K)+S(F),XS(g)
    • P(d);N_PINQ(E)::QAB(E)
    • P(h);XP(G)::B(K)+S(F),XP(h)
  • Tries
    • Try
      • K(D);CHECK,N_SPINQ(E),S_FLIGHT
      • Vars
        • R(b);CHECK,XQ(E)::B(K)+S(F),XR(b)
      • Refutation
        • B(c);P_SPINB(c)
    • Try
      • B(H);P_PINB(c)
      • Threat
        • DUALS(2)
      • Vars
        • R(b);CHECK,XQ(E)::B(K)+S(F),XR(b)
        • S(g);CHECK,XP(G)::B(K)+S(F),XS(g)
        • S(g);::B(K)+S(F),DCHECK
      • Refutation
        • S(g);XB(H)
  • Actual
    • B(H);P_PINB(c)
    • Threat
      • B(K)+S(F)
    • Vars
      • R(b);CHECK,XQ(E)::B(K)+S(F),XR(b)
      • S(g);CHECK,XP(G)::B(K)+S(F),XS(g)
      • R(b);N_GUARD,N_PINQ(E)::QAR(E)+K(D)
      • S(g);N_GUARD::R1(J),XB(c)
      • P(d);N_PINQ(E)::QAB(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).