Meson Chess Problem Database

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Problem Display

PID: 12468 (5B2/2q1rp2/1N1r1P2/PPk3N1/1R2bQ2/P1n4R/5P1K/4b3 w - - 0 1)

Quack, Godfrey C

The Problemist, 1979

5B2/2q1rp2/1N1r1P2/PPk3N1/1R2bQ2/P1n4R/5P1K/4b3

#2

12 + 8

SOLUTION

SOUND
Sets
- 1...Rd2
  - 2.Rxc3#
- 1...Rd5
  - 2.Qxc7#
- 1...Re5
  - 2.Qe3#
- 1...Re6
  - 2.Qe3#
- 1...Rd7
  - 2.Qe3#
- 1...Re8
  - 2.Qe3#
- 1...Bxf2
  - 2.Rxc3#
- 1...Bb1
  - 2.Qc4#
- 1...Bh1
  - 2.Qc4#
- 1...Bc2
  - 2.Qc4#
- 1...Bg2
  - 2.Qc4#
- 1...Bf3
  - 2.Qc4#
- 1...Bd5
  - 2.Qd4#
- 1...Bf5
  - 2.Qc4#
- 1...Bc6
  - 2.Qc4#
- 1...Bg6
  - 2.Qc4#
- 1...Bb7
  - 2.Qc4#
- 1...Bh7
  - 2.Qc4#
- 1...Ba8
  - 2.Qc4#
- 1...Sxb5
  - 2.Rc4#
- 1...Sd5
  - 2.Sa4#
Tries
- 1.Qe5+?
  - 1...Rd5
    - 2.Qxc7#
  - 1...Bd5
    - 2.Qd4#
  - 1...Sd5
    - 2.Sxe4#
    - 2.Sa4#
    - 2.Qd4#
  - 1...Rxe5!
Keys
- 1.Rh5!
  - threat
    - 2.Sxe4#
    - 2.Se6#
  - 1...Sxb5
    - 2.Rc4#
  - 1...Rd5
    - 2.Qxc7#
  - 1...Rde6
    - 2.Sxe4#
    - 2.Sxe6#
  - 1...Re5
    - 2.Qe3#
  - 1...Ree6
    - 2.Sxe4#
    - 2.Sxe6#
    - 2.Qe3#
  - 1...Bb1
    - 2.Se4#
    - 2.Se6#
    - 2.Qc4#
  - 1...Bh1
    - 2.Se4#
    - 2.Se6#
    - 2.Qc4#
  - 1...Bc2
    - 2.Se4#
    - 2.Se6#
    - 2.Qc4#
  - 1...Bg2
    - 2.Se4#
    - 2.Se6#
    - 2.Qc4#
  - 1...Bd3
    - 2.Se4#
    - 2.Se6#
  - 1...Bf3
    - 2.Se4#
    - 2.Se6#
    - 2.Qc4#
  - 1...Bd5
    - 2.Qd4#
  - 1...Bf5
    - 2.Qc4#
  - 1...Bc6
    - 2.Se4#
    - 2.Se6#
    - 2.Qc4#
  - 1...Bg6
    - 2.Se4#
    - 2.Se6#
    - 2.Qc4#
  - 1...Bb7
    - 2.Se4#
    - 2.Se6#
    - 2.Qc4#
  - 1...Bh7
    - 2.Se4#
    - 2.Se6#
    - 2.Qc4#
  - 1...Ba8
    - 2.Se4#
    - 2.Se6#
    - 2.Qc4#
  - 1...Sd5
    - 2.Sa4#

FEATURES

Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 0
- REMOVED MATES = 15
Sets
- R(e);P_PINP(A),P_PINQ(F),P_SPINR(g),S_CUTB(a)::R(D),XS(b)
- R(e);OGATE,P_PINQ(F),P_SPINR(g)::QAR2(F),XQ(f)
- R(g);P_SPINR(e)::QAB(F)
- B(a);N_GUARD,XP(A)::R(D),XS(b)
- B(c);OGATE::QAR1(F)
- B(c);OGATE::QAB1(F)
- S(b);SBLOCK,XP(H)::R1(E)
- S(b);N_GUARD,SBLOCK::S(J)
Tries
- Try
  - Q(F);CHECK
  - Vars
    - R(e);OGATE,P_PINQ(F),P_SPINR(e)::QAR2(F),XQ(f)
    - B(c);P_SPINB(c),S_CUTR(e)::QAB1(F)
  - Refutation
    - R(g);P_SPINR(e),XQ(F)
Actual
- R(D);
- Threat
  - DUALS(2)
- Vars
  - S(b);SBLOCK,XP(H)::R1(E)
  - R(e);OGATE,P_PINQ(F),P_SPINR(g)::QAR2(F),XQ(f)
  - R(g);P_SPINR(e)::QAB(F)
  - B(c);OGATE::QAB1(F)
  - B(c);OGATE::QAR1(F)
  - S(b);N_GUARD,SBLOCK::S(J)

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).