MESON Chess Problem Database

Problem Display
PID: 263322 (2N2bK1/B1R5/2N3p1/1ppk4/1r6/4R2p/b1Qn2q1/4r2B w - - 0 1)

Hjelle, David

Szachy, 1948

2N2bK1/B1R5/2N3p1/1ppk4/1r6/4R2p/b1Qn2q1/4r2B

#2

8 + 11

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Ra1
      • 2.Re5#
    • 1...Reb1
      • 2.Re5#
    • 1...Rc1
      • 2.Re5#
    • 1...Rd1
      • 2.Re5#
    • 1...Rf1
      • 2.Re5#
    • 1...Rg1
      • 2.Re5#
    • 1...Rxh1
      • 2.Re5#
    • 1...Rbb1
      • 2.Qd3#
    • 1...Rb2
      • 2.Qd3#
    • 1...Bd6
      • 2.Sb6#
    • 1...Bh6
      • 2.Qxc5#
    • 1...Bg7
      • 2.Qxc5#
    • 1...Sc4
      • 2.Qd3#
    • 1...c4
      • 2.Qxd2#
  • Tries
    • 1.Sxb4+?
      • 1...cxb4
        • 2.Qd3#
        • 2.Qxd2#
        • 2.Qc6#
      • 1...Kd4+!
    • 1.Rd7+?
      • 1...Bd6
        • 2.S8e7#
        • 2.Rxd6#
        • 2.Qxc5#
      • 1...Kxc6+!
    • 1.Qf5+?
      • 1...Kc4
        • 2.Sb6#
        • 2.Qd3#
      • 1...gxf5+!
    • 1.Qxd2+?
      • 1...Kc4
        • 2.Sa5#
        • 2.Se5#
        • 2.Sb6#
        • 2.Rc3#
        • 2.Qd3#
      • 1...Rd4!
  • Keys
    • 1.Qxg6!
      • threat
        • 2.Sb6#
      • 1...Kc4
        • 2.Sb6#
      • 1...Sc4
        • 2.Rd3#
      • 1...c4
        • 2.Qg5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 12
  • Sets
    • R(a);N_GUARD::R1(C)
    • R(a);N_GUARD,N_SPINQ(d),XB(A)::R1(C)
    • R(f);N_GUARD::QAR2(B)
    • B(k);SBLOCK::S(G)
    • B(k);N_GUARD::QAR1(B),XP(h)
    • S(c);S_CUTR(f)::QAR2(B)
    • P(h);SBLOCK,S_CUTR(f)::QAR(B),XS(c)
  • Tries
    • Try
      • S(D);CHECK,XR(f)
      • Refutation
        • K(i);CHECK,N_SPINQ(d),P-FLIGHT,P_SPINP(h)
    • Try
      • R(F);CHECK
      • Refutation
        • K(i);CHECK,P_SPINP(h),S_FLIGHT,XS(D)
    • Try
      • Q(B);CHECK
      • Refutation
        • P(j);CHECK,XQ(B)
    • Try
      • Q(B);CHECK,XS(c)
      • Refutation
        • R(f);P_SPINR(f)
  • Actual
    • Q(B);P_SPINQ(B),XP(j)
    • Threat
      • S(G)
    • Vars
      • K(i);N_SPINQ(d),S_FLIGHT::S(G)
      • S(c);SBLOCK,S_CUTR(f)::R(C)
      • P(h);SBLOCK::QAR(B)
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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).