MESON Chess Problem Database

Problem Display
PID: 188543 (Bb6/r3N1K1/1p3R2/4k1p1/2p1r3/Q1P2bqN/4n2B/4R3 w - - 0 1)

Noll, M

Schweizerische Schachzeitung, 1969

Bb6/r3N1K1/1p3R2/4k1p1/2p1r3/Q1P2bqN/4n2B/4R3

#2

9 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Rxa3
      • 2.Sg6#
    • 1...Ra4
      • 2.Sg6#
    • 1...Ra5
      • 2.Sg6#
    • 1...Ra6
      • 2.Sg6#
    • 1...Rc7
      • 2.Qd6#
    • 1...Rxe7+
      • 2.Qxe7#
    • 1...Bd6
      • 2.Qxd6#
    • 1...Bc7
      • 2.Sg6#
    • 1...Sc1
      • 2.Bxg3#
    • 1...Sg1
      • 2.Bxg3#
    • 1...Sxc3
      • 2.Qxc3#
    • 1...Sd4
      • 2.Bxg3#
    • 1...b5
      • 2.Qc5#
  • Tries
    • 1.Qa5+?
      • 1...Rxa5
        • 2.Sg6#
      • 1...b5
        • 2.Qxb5#
      • 1...bxa5!
    • 1.Qxa7?
      • threat
        • 2.Sg6#
        • 2.Qxb8#
      • 1...Bxa7
        • 2.Sg6#
      • 1...Rd4
        • 2.Sg6#
      • 1...Bh5
        • 2.Qxb8#
      • 1...Bd6
        • 2.Sg6#
      • 1...Bc7
        • 2.Sg6#
        • 2.Qxc7#
      • 1...Sf4
        • 2.Qxb8#
      • 1...Sxc3!
  • Keys
    • 1.Sxg5!
      • threat
        • 2.Rf5#
      • 1...Rxe7+
        • 2.Qxe7#
      • 1...Rxa3
        • 2.Sg6#
      • 1...Sxc3
        • 2.Qxc3#
      • 1...Rf4
        • 2.Re6#
      • 1...Bg4
        • 2.Sf7#
      • 1...Sd4
        • 2.Bxg3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 9
  • Sets
    • R(i);N_PINS(G),XQ(C)::S(G)
    • R(i);N_PINS(G)::S(G)
    • R(i);S_CUTB(j)::QAB1(C)
    • R(i);CHECK,OGATE,XS(G)::QAR2(C),XR(i)
    • B(j);N_GUARD::QAB1(C),XB(j)
    • B(j);N_PINS(G)::S(G)
    • S(a);N_GUARD,P_SPINR(e)::B(B),XQ(c)
    • S(a);OGATE,P_SPINR(e),XP(D)::QAB(C),XS(a)
    • P(h);N_GUARD::QAR2(C)
  • Tries
    • Try
      • Q(C);CHECK
      • Vars
        • R(i);N_PINS(G),XQ(C)::S(G)
        • P(h);P_SPINP(h)::QAR(C),XP(h)
      • Refutation
        • P(h);XQ(C)
    • Try
      • Q(C);N_SPINS(G),XR(i)
      • Threat
        • DUALS(2)
      • Vars
        • B(j);XQ(C)::S(G)
        • R(e);P_SPINS(a)::S(G)
        • B(b);::QAB(C),XB(j)
        • B(j);::S(G)
        • S(a);N_SPINQ(c),P_SPINR(e)::QAB(C),XB(j)
      • Refutation
        • S(a);P_SPINR(e),XP(D)
  • Actual
    • S(E);N_SPINS(G),P_SPINS(E),XP(g)
    • Threat
      • R1(F)
    • Vars
      • R(i);CHECK,OGATE,XS(G)::QAR2(C),XR(i)
      • R(i);XQ(C)::S(G)
      • S(a);OGATE,P_SPINR(e),XP(D)::QAB(C),XS(a)
      • R(e);N_SPINQ(c),P_SPINS(a),SBLOCK::R1(F)
      • B(b);N_PINS(E),P_PINS(G)::S(E)
      • S(a);N_GUARD,P_SPINR(e)::B(B),XQ(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).