Meson Chess Problem Database

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Problem Display

PID: 138981 (8/n2NN1n1/1p1B1p2/3B4/3k1p1p/1P4pR/3K3P/8 w - - 0 1)

Cox, C

The Problemist, 1936

8/n2NN1n1/1p1B1p2/3B4/3k1p1p/1P4pR/3K3P/8

#2

8 + 8

SOLUTION

SOUND
Sets
- 1...gxh2
  - 2.Rd3#
- 1...g2
  - 2.Rd3#
- 1...f3
  - 2.Rxh4#
- 1...b5
  - 2.Bc5#
- 1...f5
  - 2.Be5#
Tries
- 1.Se5?
  - threat
    - 2.Sf3#
  - 1...f3
    - 2.Sxf3#
    - 2.Rxh4#
  - 1...fxe5!
- 1.Sxb6?
  - 1...gxh2
    - 2.Rd3#
  - 1...Sb5
    - 2.Sc6#
  - 1...Sc6
    - 2.Sxc6#
  - 1...Sc8
    - 2.Sc6#
  - 1...Sf5
    - 2.Sxf5#
  - 1...Sh5
    - 2.Sf5#
  - 1...Se6
    - 2.Sf5#
  - 1...Se8
    - 2.Sf5#
  - 1...g2
    - 2.Rd3#
  - 1...f3
    - 2.Rxh4#
  - 1...f5!
- 1.Sxf6?
  - 1...gxh2
    - 2.Rd3#
  - 1...Sb5
    - 2.Sc6#
  - 1...Sc6
    - 2.Sxc6#
  - 1...Sc8
    - 2.Sc6#
  - 1...Sf5
    - 2.Sxf5#
  - 1...Sh5
    - 2.Sf5#
  - 1...Se6
    - 2.Sf5#
  - 1...Se8
    - 2.Sf5#
  - 1...g2
    - 2.Rd3#
  - 1...f3
    - 2.Rxh4#
  - 1...b5!
- 1.Bh1?
  - 1...gxh2
    - 2.Rd3#
  - 1...f3
    - 2.Rxh4#
  - 1...Sb5
    - 2.Sc6#
  - 1...Sc6
    - 2.Sxc6#
  - 1...Sc8
    - 2.Sc6#
  - 1...Sf5
    - 2.Sxf5#
  - 1...Sh5
    - 2.Sf5#
  - 1...Se6
    - 2.Sf5#
  - 1...Se8
    - 2.Sf5#
  - 1...b5
    - 2.Bc5#
  - 1...f5
    - 2.Be5#
  - 1...g2!
Keys
- 1.Bg2!
  - 1...gxh2
    - 2.Rd3#
  - 1...f3
    - 2.Rxh4#
  - 1...Sb5
    - 2.Sc6#
  - 1...Sc6
    - 2.Sxc6#
  - 1...Sc8
    - 2.Sc6#
  - 1...Sf5
    - 2.Sxf5#
  - 1...Sh5
    - 2.Sf5#
  - 1...Se6
    - 2.Sf5#
  - 1...Se8
    - 2.Sf5#
  - 1...b5
    - 2.Bc5#
  - 1...f5
    - 2.Be5#

FEATURES

Static
- TYPE = INCOMPLETE_BLOCK
- CHANGED MATES = 0
- ADDED MATES = 7
- REMOVED MATES = 1
Sets
- P(a);OGATE,XP(B)::R1(D)
- P(a);OGATE::R1(D)
- P(c);OGATEB::R(D),XP(d)
- P(e);N_GUARD::B(F)
- P(f);N_GUARD::B(F)
Tries
- Try
  - S(G);
  - Threat
    - S(G)
  - Refutation
    - P(f);XS(G)
- Try
  - S(G);XP(e)
  - Vars
    - P(a);OGATE,XP(B)::R1(D)
    - S(g);N_GUARD::S(H)
    - S(g);N_GUARD::S(H),XS(g)
    - S(h);N_GUARD::S(H),XS(h)
    - S(h);N_GUARD::S(H)
    - P(a);OGATE::R1(D)
    - P(c);OGATEB::R(D),XP(d)
  - Refutation
    - P(f);
- Try
  - S(G);XP(f)
  - Vars
    - P(a);OGATE,XP(B)::R1(D)
    - S(g);N_GUARD::S(H)
    - S(g);N_GUARD::S(H),XS(g)
    - S(h);N_GUARD::S(H),XS(h)
    - S(h);N_GUARD::S(H)
    - P(a);OGATE::R1(D)
    - P(c);OGATEB::R(D),XP(d)
  - Refutation
    - P(e);
- Try
  - B(E);
  - Vars
    - P(a);OGATE,XP(B)::R1(D)
    - P(c);OGATEB::R(D),XP(d)
    - S(g);N_GUARD::S(H)
    - S(g);N_GUARD::S(H),XS(g)
    - S(h);N_GUARD::S(H),XS(h)
    - S(h);N_GUARD::S(H)
    - P(e);N_GUARD::B(F)
    - P(f);N_GUARD::B(F)
  - Refutation
    - P(a);
Actual
- B(E);
- Vars
  - P(a);OGATE,XP(B)::R1(D)
  - P(c);OGATEB::R(D),XP(d)
  - S(g);N_GUARD::S(H)
  - S(g);N_GUARD::S(H),XS(g)
  - S(h);N_GUARD::S(H),XS(h)
  - S(h);N_GUARD::S(H)
  - P(e);N_GUARD::B(F)
  - P(f);N_GUARD::B(F)

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).