Meson Chess Problem Database

Basisty, Mark Borisovich

SuperProblem, 2021

8 + 12

6490	yacpdb	2022

Static
- TYPE = THREAT
- CHANGED MATES = 2
- ADDED MATES = 6
- REMOVED MATES = 2
Sets
- R(c);N_GUARD::R1(C),XP(b)
- R(c);OGATEB::QAB(A)+R(B),XR(c)
- R(c);OGATEB,XB(D)::QAB(A)+R(B)
- S(a);N_GUARD::QAB(A),XS(a)
- P(b);OGATEB::R(B),XP(b)
Tries
- Try
  - R(B);P_PINR(c)
  - Threat
    - DUALS(2)
  - Vars
    - Q(g);::R1(B)
    - R(j);N_SPINR(c)::R1(B)
    - P(i);::R1(B),XP(i)
    - P(k);::R1(C),XP(b)
  - Refutation
    - S(a);
- Try
  - R(B);P_PINR(c)
  - Threat
    - DUALS(2)
  - Vars
    - Q(g);XR(B)::R1(C),XP(b)
    - R(j);XR(B)::R1(C),XP(b)
    - Q(g);::R1(C),XP(b)
    - S(a);::QAB1(A),XR(c)
    - P(i);::QAB1(A),XR(c)
  - Refutation
    - Q(g);P_PINP(E),XB(D)
- Try
  - R(B);P_PINR(c)
  - Threat
    - R1(C),XP(b)
  - Vars
    - Q(g);N_GUARD::R(B)+B(D),XR(j)
    - P(i);SBLOCK::S(G)
  - Refutation
    - S(a);
- Try
  - Q(A);CHECK
  - Vars
    - S(a);N_GUARD,P_SPINS(a)::QAB(A),XS(a)
  - Refutation
    - S(a);XQ(A)
- Try
  - Q(A);
  - Threat
    - QAR1(A)
  - Vars
    - R(c);SBLOCK,XB(D)::S(G)
    - R(c);N_GUARD::R1(C),XP(b)
    - S(a);N_GUARD::QAB(A),XS(a)
    - P(i);::QAR1(A),XP(i)
    - P(k);N_GUARD::QAB1(A),XP(i)
  - Refutation
    - R(c);
Actual
- B(D);XP(b)
- Threat
  - S(G)
- Vars
  - R(c);XB(D)::QAB(A)+R(B),DCHECK
  - R(c);::QAB(A)+R(B),DCHECK
  - R(c);OGATEB::QAB(A)+R(B),XR(c)
  - R(c);S_CUTQ(g),S_CUTR(j)::QAB(A)+R(B)
  - R(c);P_PINS(G)::QAB(A)+R(B),DCHECK
  - P(k);::S(G),XP(k)

MESON Chess Problem Database