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Problem Display

PID: 208115 (K1B4n/6N1/7R/6k1/Q6N/6r1/8/8 w - - 0 1)

Babson, Joseph Ney

Dubuque Chess Journal, 1874

K1B4n/6N1/7R/6k1/Q6N/6r1/8/8

#2

6 + 3

6490	yacpdb	2020

SOLUTION

SOUND
Sets
- 1...Sg6
  - 2.Rxg6#
- 1...Sf7
  - 2.Rg6#
Tries
- 1.Sf3+?
  - 1...Rxf3
    - 2.Qh4#
  - 1...Kxh6!
- 1.Rb6?
  - 1...Rg4
    - 2.Sf3#
    - 2.Qxg4#
  - 1...Sg6
    - 2.Rxg6#
  - 1...Rg1
    - 2.Sf3#
  - 1...Rg2
    - 2.Sf3#
  - 1...Rb3
    - 2.Qg4#
  - 1...Rc3
    - 2.Qg4#
  - 1...Rd3
    - 2.Qg4#
  - 1...Re3
    - 2.Qg4#
  - 1...Rf3
    - 2.Sxf3#
    - 2.Qg4#
  - 1...Rh3
    - 2.Qg4#
  - 1...Sf7
    - 2.Rg6#
  - 1...Ra3!
- 1.Rc6?
  - 1...Rg4
    - 2.Sf3#
    - 2.Qxg4#
  - 1...Sg6
    - 2.Rxg6#
  - 1...Rg1
    - 2.Sf3#
  - 1...Rg2
    - 2.Sf3#
  - 1...Rb3
    - 2.Qg4#
  - 1...Rc3
    - 2.Qg4#
  - 1...Rd3
    - 2.Qg4#
  - 1...Re3
    - 2.Qg4#
  - 1...Rf3
    - 2.Sxf3#
    - 2.Qg4#
  - 1...Rh3
    - 2.Qg4#
  - 1...Sf7
    - 2.Rg6#
  - 1...Ra3!
- 1.Rd6?
  - 1...Rg4
    - 2.Sf3#
    - 2.Qxg4#
  - 1...Sg6
    - 2.Rxg6#
  - 1...Rg1
    - 2.Sf3#
  - 1...Rg2
    - 2.Sf3#
  - 1...Rb3
    - 2.Qg4#
  - 1...Rc3
    - 2.Qg4#
  - 1...Rd3
    - 2.Qg4#
  - 1...Re3
    - 2.Qg4#
  - 1...Rf3
    - 2.Sxf3#
    - 2.Qg4#
  - 1...Rh3
    - 2.Qg4#
  - 1...Sf7
    - 2.Rg6#
  - 1...Ra3!
Keys
- 1.Ra6!
  - 1...Rg4
    - 2.Sf3#
    - 2.Qxg4#
  - 1...Sg6
    - 2.Rxg6#
  - 1...Ra3
    - 2.Qg4#
  - 1...Rg1
    - 2.Sf3#
  - 1...Rg2
    - 2.Sf3#
  - 1...Rb3
    - 2.Qg4#
  - 1...Rc3
    - 2.Qg4#
  - 1...Rd3
    - 2.Qg4#
  - 1...Re3
    - 2.Qg4#
  - 1...Rf3
    - 2.Sxf3#
    - 2.Qg4#
  - 1...Rh3
    - 2.Qg4#
  - 1...Sf7
    - 2.Rg6#

FEATURES

Static
- TYPE = INCOMPLETE_BLOCK
- CHANGED MATES = 0
- ADDED MATES = 8
- REMOVED MATES = 0
Sets
- S(c);N_GUARD::R1(C),XS(c)
- S(c);N_GUARD::R1(C)
Tries
- Try
  - S(B);CHECK
  - Vars
    - R(a);XS(B)::QAB1(A)
  - Refutation
    - K(b);S_FLIGHT,XR(C)
- Try
  - R(C);
  - Vars
    - S(c);N_GUARD::R1(C),XS(c)
    - R(a);N_GUARD::S(B)
    - R(a);N_GUARD::QAR1(A)
    - S(c);N_GUARD::R1(C)
  - Refutation
    - R(a);P_PINQ(A)
- Try
  - R(C);
  - Vars
    - S(c);N_GUARD::R1(C),XS(c)
    - R(a);N_GUARD::S(B)
    - R(a);N_GUARD::QAR1(A)
    - S(c);N_GUARD::R1(C)
  - Refutation
    - R(a);P_PINQ(A)
- Try
  - R(C);
  - Vars
    - S(c);N_GUARD::R1(C),XS(c)
    - R(a);N_GUARD::S(B)
    - R(a);N_GUARD::QAR1(A)
    - S(c);N_GUARD::R1(C)
  - Refutation
    - R(a);P_PINQ(A)
Actual
- R(C);
- Vars
  - S(c);N_GUARD::R1(C),XS(c)
  - R(a);N_GUARD::QAR1(A)
  - R(a);N_GUARD::S(B)
  - S(c);N_GUARD::R1(C)

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).