MESON Chess Problem Database

Problem Display
PID: 204383 (8/3Pr1q1/3PR1N1/1pQ1ppp1/1pp1kbnR/3r1N1K/1Bn1PpP1/1B6 w - - 0 1)

Nielsen, Kristian

L'Alfiere di Re, 1925

8/3Pr1q1/3PR1N1/1pQ1ppp1/1pp1kbnR/3r1N1K/1Bn1PpP1/1B6

#2

12 + 14

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Ra3
      • 2.Qd4#
    • 1...Rb3
      • 2.Qd4#
    • 1...Rc3
      • 2.Qd4#
    • 1...Re3
      • 2.Qd4#
      • 2.Qc6#
    • 1...Rxf3+
      • 2.gxf3#
    • 1...Rd4
      • 2.Qxd4#
    • 1...Bg3
      • 2.Sxg5#
    • 1...Sa1
      • 2.Qd4#
    • 1...Se1
      • 2.Qd4#
    • 1...Sa3
      • 2.Qd4#
    • 1...Sce3
      • 2.Sd2#
      • 2.Qd4#
    • 1...Sd4
      • 2.Qxd4#
    • 1...Sge3
      • 2.Sxg5#
    • 1...Sf6
      • 2.Qxe5#
  • Tries
    • 1.Bxc2?
      • threat
        • 2.Qd4#
      • 1...Be3
        • 2.Qc6#
      • 1...Rxe6!
    • 1.Qxc4+?
      • 1...Ke3
        • 2.Qxd3#
      • 1...Rd4
        • 2.Qxd4#
      • 1...Sd4
        • 2.Qxd4#
      • 1...bxc4!
  • Keys
    • 1.Bd4!
      • threat
        • 2.Qc6#
      • 1...Rxf3+
        • 2.gxf3#
      • 1...Rxd4
        • 2.Qxd4#
      • 1...Sxd4
        • 2.Qxd4#
      • 1...Sce3
        • 2.Sd2#
      • 1...Sge3
        • 2.Sxg5#
      • 1...Sf6
        • 2.Qxe5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 7
  • Sets
    • R(c);N_GUARD,P_SPINS(a)::QAR1(H)
    • R(c);CHECK,OGATE,P_SPINS(a),XS(E)::P(D),XR(c)
    • R(c);N_GUARD,N_PINS(E),P_SPINS(a)::QAR1(H),XR(c)
    • B(g);N_PINS(E),P_SPINS(h)::S(E),XP(l)
    • S(a);N_GUARD,P_SPINR(c)::QAR1(H)
    • S(a);N_GUARD,P_SPINR(c)::QAR1(H),XS(a)
    • S(h);N_PINS(E),P_SPINB(g)::S(E),XP(l)
    • S(h);N_GUARD,P_SPINB(g),S_CUTQ(n)::QAR1(H),XP(j)
  • Tries
    • Try
      • B(A);P_PINR(c),XS(a)
      • Threat
        • QAR1(H)
      • Vars
        • B(g);N_PINS(E),P_SPINS(h),SBLOCK::QAB(H)
      • Refutation
        • R(m);N_SPINP(j),XR(J)
    • Try
      • Q(H);CHECK,XP(e)
      • Vars
        • K(f);N_PINS(E),P-FLIGHT::QAR1(H),XR(c)
        • R(c);N_GUARD,N_PINS(E),P_SPINR(c),P_SPINS(a)::QAR1(H),XR(c)
        • S(a);N_GUARD,P_SPINR(c),P_SPINS(a)::QAR1(H),XS(a)
      • Refutation
        • P(i);XQ(H)
  • Actual
    • B(B);
    • Threat
      • QAB(H)
    • Vars
      • R(c);CHECK,OGATE,P_SPINS(a),XS(E)::P(D),XR(c)
      • R(c);N_PINS(E),OGATE,P_SPINS(a),XB(B)::QAR1(H),XR(c)
      • S(a);OGATE,P_SPINR(c),XB(B)::QAR1(H),XS(a)
      • S(a);N_PINS(E),P_SPINR(c)::S(E)
      • S(h);N_PINS(E),P_SPINB(g)::S(E),XP(l)
      • S(h);N_GUARD,P_SPINB(g),S_CUTQ(n)::QAR1(H),XP(j)
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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).