MESON Chess Problem Database

Problem Display
PID: 272695 (qb5Q/8/4B3/pR1rBP1p/Rn2k3/4P1P1/4PK2/2N2N2 w - - 0 1)

Klein, A

Schakend Nederland, 1976

qb5Q/8/4B3/pR1rBP1p/Rn2k3/4P1P1/4PK2/2N2N2

#2

12 + 7

15601 Albrecht-Leiss-Degener Collection 2023

SOLUTION

  • SOUND
  • Sets
    • 1...Rd2
      • 2.Sxd2#
    • 1...Rd3
      • 2.exd3#
    • 1...Rxb5
      • 2.Sd2#
    • 1...Rc5
      • 2.Sd2#
    • 1...Rxe5
      • 2.Sd2#
  • Tries
    • 1.Bxd5+?
      • 1...Kxf5
        • 2.Qxh5#
      • 1...Qxd5!
    • 1.Raxb4+?
      • 1...Rd4
        • 2.Sd2#
        • 2.Rxd4#
      • 1...axb4!
    • 1.Rbxb4+?
      • 1...Rd4
        • 2.Sd2#
        • 2.Rxd4#
      • 1...axb4!
    • 1.Rxd5?
      • threat
        • 2.Sd2#
        • 2.Rd4#
      • 1...Bxe5
        • 2.Sd2#
        • 2.Rxe5#
        • 2.Qxe5#
      • 1...Qa7
        • 2.Sd2#
      • 1...Ba7
        • 2.Sd2#
      • 1...Qxd5!
  • Keys
    • 1.Bd4!
      • threat
        • 2.Sd2#
      • 1...Rxf5+
        • 2.Bxf5#
      • 1...Bxg3+
        • 2.Sxg3#
      • 1...Sd3+
        • 2.exd3#
      • 1...Rxd4
        • 2.Qxd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 5
  • Sets
    • R(d);N_GUARD,P_PINP(C)::S(B),XR(d)
    • R(d);OGATE::P(C),XR(d)
    • R(d);N_GUARD,XR(H)::S(B)
    • R(d);N_GUARD::S(B)
    • R(d);N_GUARD,XB(I)::S(B)
  • Tries
    • Try
      • B(K);CHECK,XR(d)
      • Vars
        • K(b);N_GUARD,N_SPINS(a),S_CUTQ(f),S_FLIGHT,XP(J)::QAR2(L),XP(e)
      • Refutation
        • Q(f);XB(K)
    • Try
      • R(G);CHECK,XS(a)
      • Refutation
        • P(c);XR(G)
    • Try
      • R(H);CHECK,XS(a)
      • Refutation
        • P(c);P_SPINP(c),XR(H)
    • Try
      • R(H);XR(d)
      • Threat
        • DUALS(2)
      • Vars
        • Q(f);P_PINP(E)::S(B)
        • B(g);P_PINP(E)::S(B)
      • Refutation
        • Q(f);XR(H)
  • Actual
    • B(I);N_PINS(a)
    • Threat
      • S(B)
    • Vars
      • R(d);CHECK,OGATE,XP(J)::B(K),XR(d)
      • B(g);CHECK,XP(F)::S(B),XB(g)
      • S(a);CHECK,OGATE::P(C),XS(a)
      • R(d);OGATE,XB(I)::QAR1(L),XR(d)
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).