Meson Chess Problem Database

Fenner, A Jack

Vaughan, Colin V

Busmen's Chess Review, 1968

10 + 6

Static
- TYPE = THREAT
- CHANGED MATES = 2
- ADDED MATES = 3
- REMOVED MATES = 2
Sets
- K(d);OGATE,S_FLIGHT::P(B)
- R(e);SBLOCK,S_CUTB(b)::S(H),XP(f)
- B(b);SBLOCK,S_CUTR(e)::S(H)
- P(f);SBLOCK,S_CUTR(e)::B(J)
Tries
- Try
  - S(H);CHECK
  - Vars
    - K(d);P-FLIGHT::QAR2(G)
  - Refutation
    - R(e);XS(H)
- Try
  - S(H);CHECK,XP(f)
  - Vars
    - K(d);P-FLIGHT::QAR2(G)
  - Refutation
    - B(b);XS(H)
- Try
  - B(J);CHECK
  - Vars
    - K(d);OGATE,S_FLIGHT::P(B)
  - Refutation
    - R(e);P_SPINR(e)
- Try
  - R(A);
  - Threat
    - DUALS(2)
  - Vars
    - P(c);XP(B)::R1(A)
    - R(e);::P(B),XP(c)
    - B(b);::R1(A)
  - Refutation
    - S(a);
- Try
  - Q(G);CHECK
  - Vars
    - R(e);N_GUARD,P_SPINR(e)::QAR2(G),XR(e)
  - Refutation
    - K(d);S_FLIGHT
- Try
  - Q(G);CHECK
  - Refutation
    - K(d);S_FLIGHT
- Try
  - P(B);CHECK,XP(c)
  - Refutation
    - K(d);S_FLIGHT
- Try
  - P(E);CHECK
  - Vars
    - R(e);P_SPINR(e)::B(J)
    - P(f);P_SPINP(f)::B(J)
  - Refutation
    - R(e);P_SPINR(e)
Actual
- S(H);
- Threat
  - R(A)+P(B)DCHECK,XP(c)
- Vars
  - K(d);OGATEB,P-FLIGHT,XS(H)::QAR2(G)
  - R(e);N_GUARD,SBLOCK,XS(H)::QAR(G)
  - B(b);SBLOCK,XS(H)::QAB(G)
  - P(c);OGATE,P_SPINP(c),XP(B)::R(A),XP(c)
  - P(f);SBLOCK,XS(H)::QAB(G)

MESON Chess Problem Database