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Problem Display

PID: 244153 (q5n1/4B2B/1pRP4/3kbP2/2R2pN1/1P1NpP2/2np3K/6Q1 w - - 0 1)

Bennett, Frederick

Chess World (The), 1951

q5n1/4B2B/1pRP4/3kbP2/2R2pN1/1P1NpP2/2np3K/6Q1

#2

12 + 9

15148	Sadier Collection	2021

SOLUTION

SOUND
Sets
- 1...Qxc6
  - 2.Bxg8#
- 1...Qb7
  - 2.Bxg8#
- 1...Qa1
  - 2.Bxg8#
- 1...Qa2
  - 2.Bxg8#
- 1...Qa3
  - 2.Bxg8#
- 1...Qa4
  - 2.Bxg8#
- 1...Qa5
  - 2.Bxg8#
- 1...Qa6
  - 2.Bxg8#
- 1...Qa7
  - 2.Bxg8#
- 1...Ba1
  - 2.Sxf4#
- 1...Bb2
  - 2.Sxf4#
- 1...Bc3
  - 2.Sxf4#
- 1...Bd4
  - 2.Sxf4#
- 1...Bxd6
  - 2.Rxd6#
- 1...Bf6
  - 2.Sxf4#
- 1...Bg7
  - 2.Sxf4#
- 1...Bh8
  - 2.Sxf4#
- 1...Sa1
  - 2.Sb4#
- 1...Se1
  - 2.Sb4#
- 1...Sa3
  - 2.Sb4#
- 1...Sb4
  - 2.Sxb4#
- 1...Sd4
  - 2.Sb4#
- 1...b5
  - 2.R6c5#
Tries
- 1.Sxe3+?
  - 1...Sxe3
    - 2.Sb4#
  - 1...fxe3+!
- 1.Qxe3?
  - threat
    - 2.Qe4#
    - 2.Qxe5#
  - 1...Bxd6
    - 2.Rxd6#
    - 2.Qe4#
    - 2.Qe6#
  - 1...Sxe3
    - 2.Sb4#
  - 1...Qa1
    - 2.Bxg8#
    - 2.Qe4#
  - 1...Ba1
    - 2.Sxf4#
    - 2.Qe4#
    - 2.Qe6#
  - 1...Bb2
    - 2.Sxf4#
    - 2.Qe4#
    - 2.Qe6#
  - 1...Bc3
    - 2.Sxf4#
    - 2.Qe4#
    - 2.Qe6#
  - 1...Bd4
    - 2.Sxf4#
    - 2.Qe4#
    - 2.Qe6#
  - 1...Bf6
    - 2.Sxf4#
    - 2.Qe4#
    - 2.Qe6#
  - 1...Bg7
    - 2.Sxf4#
    - 2.Qe4#
    - 2.Qe6#
  - 1...Bh8
    - 2.Sxf4#
    - 2.Qe4#
    - 2.Qe6#
  - 1...Sf6
    - 2.Qxe5#
  - 1...fxe3+!
Keys
- 1.Qa1!
  - threat
    - 2.Qxe5#
  - 1...Qxa1
    - 2.Bxg8#
  - 1...Bxa1
    - 2.Sxf4#
  - 1...Bxd6
    - 2.Rxd6#
  - 1...Sxa1
    - 2.Sb4#
  - 1...Bb2
    - 2.Sxf4#
  - 1...Bc3
    - 2.Sxf4#
  - 1...Bd4
    - 2.Sxf4#
  - 1...Bf6
    - 2.Sxf4#
  - 1...Bg7
    - 2.Sxf4#
  - 1...Bh8
    - 2.Sxf4#
  - 1...Sd4
    - 2.Sb4#

FEATURES

Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 0
- REMOVED MATES = 12
Sets
- Q(h);N_GUARD,XR(I)::B(L),XS(i)
- Q(h);N_GUARD::B(L),XS(i)
- B(f);N_GUARD::S(D),XP(d)
- B(f);OGATE,XP(J)::R1(I),XB(f)
- S(a);N_GUARD::S(D)
- S(a);N_GUARD::S(D),XS(a)
- P(g);N_GUARD::R1(I)
Tries
- Try
  - S(G);CHECK,XP(c)
  - Vars
    - S(a);XS(G)::S(D)
  - Refutation
    - P(d);CHECK,XS(G)
- Try
  - Q(A);XP(c)
  - Threat
    - DUALS(2)
  - Vars
    - S(a);N_GUARD,XQ(A)::S(D)
    - S(i);::QAR1(A),XB(f)
  - Refutation
    - P(d);CHECK,XQ(A)
Actual
- Q(A);
- Threat
  - QAR1(A),XB(f)
- Vars
  - Q(h);N_GUARD,XQ(A)::B(L),XS(i)
  - B(f);N_GUARD,XQ(A)::S(D),XP(d)
  - B(f);OGATE,XP(J)::R1(I),XB(f)
  - S(a);N_GUARD,XQ(A)::S(D)
  - B(f);N_GUARD::S(D),XP(d)
  - S(a);N_GUARD::S(D)

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