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Problem Display

PID: 98221 (4B2B/8/8/3n1n1N/3Pk3/4P3/3Q1K2/1b6 w - - 0 1)

Lincoln, Robert A

US Problem Bulletin, 1992

4B2B/8/8/3n1n1N/3Pk3/4P3/3Q1K2/1b6

#2

7 + 4

6490	yacpdb	2009
5454	Near Snap	2011

SOLUTION

SOUND
Sets
- 1...Ba2
  - 2.Qc2#
- 1...Bc2
  - 2.Qxc2#
- 1...Sc3
  - 2.Sf6#
- 1...Sb4
  - 2.Sf6#
- 1...Sf4
  - 2.Sf6#
- 1...Sb6
  - 2.Sf6#
- 1...Sf6
  - 2.Sxf6#
- 1...Sc7
  - 2.Sf6#
- 1...Sde7
  - 2.Sf6#
- 1...Sg3
  - 2.Sxg3#
- 1...Sxd4
  - 2.Sg3#
- 1...Sh4
  - 2.Sg3#
- 1...Sd6
  - 2.Sg3#
- 1...Sh6
  - 2.Sg3#
- 1...Sfe7
  - 2.Sg3#
- 1...Sg7
  - 2.Sg3#
Tries
- 1.Bc6?
  - threat
    - 2.Sf6#
  - 1...Sxd4
    - 2.Sg3#
  - 1...Sg3
    - 2.Sxg3#
  - 1...Sh4
    - 2.Sg3#
  - 1...Sd6
    - 2.Sg3#
  - 1...Sh6
    - 2.Sg3#
  - 1...Se7
    - 2.Sg3#
  - 1...Sg7
    - 2.Sg3#
  - 1...Sxe3!
- 1.Bg6?
  - threat
    - 2.Sg3#
  - 1...Sc3
    - 2.Sf6#
  - 1...Sb4
    - 2.Sf6#
  - 1...Sf4
    - 2.Sf6#
  - 1...Sb6
    - 2.Sf6#
  - 1...Sf6
    - 2.Sxf6#
  - 1...Sc7
    - 2.Sf6#
  - 1...Se7
    - 2.Sf6#
  - 1...Sxe3!
Keys
- 1.Qe2!
  - 1...Sdxe3
    - 2.Bc6#
  - 1...Sfxe3
    - 2.Bg6#
  - 1...Sxd4
    - 2.Sg3#
  - 1...Sc3
    - 2.Sf6#
  - 1...Sb4
    - 2.Sf6#
  - 1...Sf4
    - 2.Sf6#
  - 1...Sb6
    - 2.Sf6#
  - 1...Sf6
    - 2.Sxf6#
  - 1...Sc7
    - 2.Sf6#
  - 1...Sde7
    - 2.Sf6#
  - 1...Sg3
    - 2.Sxg3#
  - 1...Sh4
    - 2.Sg3#
  - 1...Sd6
    - 2.Sg3#
  - 1...Sh6
    - 2.Sg3#
  - 1...Sfe7
    - 2.Sg3#
  - 1...Sg7
    - 2.Sg3#
  - 1...Ba2
    - 2.Qc2#
  - 1...Bc2
    - 2.Qxc2#
  - 1...Bd3
    - 2.Qf3#

Anticipated by 276(1950-1951), 22534(1979-1980)

FEATURES

Static
- TYPE = INCOMPLETE_BLOCK
- CHANGED MATES = 0
- ADDED MATES = 3
- REMOVED MATES = 0
Sets
- B(a);N_GUARD::QAB(A)
- B(a);N_GUARD::QAB(A),XB(a)
- S(c);N_GUARD::S(E)
- S(c);N_GUARD::S(E),XS(c)
- S(d);N_GUARD::S(E),XS(d)
- S(d);N_GUARD,XP(D)::S(E)
- S(d);N_GUARD::S(E)
Tries
- Try
  - B(F);P_PINS(c)
  - Threat
    - S(E)
  - Vars
    - S(d);N_GUARD,XP(D)::S(E)
    - S(d);N_GUARD::S(E),XS(d)
    - S(d);N_GUARD::S(E)
  - Refutation
    - S(d);XP(C)
- Try
  - B(F);P_PINS(d)
  - Threat
    - S(E)
  - Vars
    - S(c);N_GUARD::S(E)
    - S(c);N_GUARD::S(E),XS(c)
  - Refutation
    - S(c);XP(C)
Actual
- Q(A);
- Vars
  - S(c);OGATEB,P_SPINS(c),XP(C)::B(F)
  - S(d);OGATEB,P_SPINS(d),XP(C)::B(F)
  - S(d);N_GUARD,XP(D)::S(E)
  - S(c);N_GUARD::S(E)
  - S(c);N_GUARD::S(E),XS(c)
  - S(d);N_GUARD::S(E),XS(d)
  - S(d);N_GUARD::S(E)
  - B(a);N_GUARD::QAB(A)
  - B(a);N_GUARD::QAB(A),XB(a)
  - B(a);SBLOCK::QAB1(A)

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).