MESON Chess Problem Database

Problem Display
PID: 84175 (8/P1N2ppr/1B1p3n/R2PpP1B/ppp1k3/q2N2nK/3Q4/4rR2 w - - 0 1)

Cheylan, Yves

The Observer, 1975

8/P1N2ppr/1B1p3n/R2PpP1B/ppp1k3/q2N2nK/3Q4/4rR2

#2

11 + 13

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Ra1
      • 2.Qe3#
    • 1...Rb1
      • 2.Qe3#
    • 1...Rc1
      • 2.Qe3#
    • 1...Rd1
      • 2.Qe3#
    • 1...Re3
      • 2.Qxe3#
    • 1...Se2
      • 2.Qe3#
    • 1...Sgxf5
      • 2.Bf3#
    • 1...Shxf5
      • 2.Sf2#
    • 1...cxd3
      • 2.Qg2#
  • Tries
    • 1.Se8?
      • threat
        • 2.Sxd6#
      • 1...Sgxf5
        • 2.Bf3#
      • 1...Shxf5
        • 2.Sf2#
      • 1...b3!
    • 1.Qxe1+?
      • 1...Se2
        • 2.Qxe2#
      • 1...Kxd3!
  • Keys
    • 1.Sb5!
      • threat
        • 2.Sxd6#
      • 1...Kxd5
        • 2.a8Q#
        • 2.a8B#
      • 1...Sgxf5
        • 2.Bf3#
      • 1...Shxf5
        • 2.Sf2#
      • 1...b3
        • 2.Sc3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 7
  • Sets
    • R(a);N_GUARD::QAR1(B)
    • R(a);N_GUARD::QAR1(B),XR(a)
    • S(c);P_PINS(C),S_CUTR(a)::QAR1(B)
    • S(c);P_PINS(C),SBLOCK,XP(G)::B(H)
    • S(j);P_PINB(H),SBLOCK,XP(G)::S(C)
    • P(f);SBLOCK,XS(C)::QAB(B)
  • Tries
    • Try
      • S(K);
      • Threat
        • S(K),XP(i)
      • Vars
        • S(c);P_PINS(C),SBLOCK,XP(G)::B(H)
        • S(j);P_PINB(H),SBLOCK,XP(G)::S(C)
      • Refutation
        • P(e);
    • Try
      • Q(B);CHECK,XR(a)
      • Vars
        • S(c);N_GUARD,P_PINS(C),P_SPINS(c)::QAR2(B),XS(c)
      • Refutation
        • K(g);S_FLIGHT,XS(C)
  • Actual
    • S(K);
    • Threat
      • S(K),XP(i)
    • Vars
      • K(g);S_FLIGHT,XP(F)::P=Q
      • S(c);P_PINS(C),SBLOCK,XP(G)::B(H)
      • S(j);P_PINB(H),SBLOCK,XP(G)::S(C)
      • P(e);N_GUARD,S_CUTQ(b)::S(K)
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).