MESON Chess Problem Database
Problem Display
PID: 184910 (8/8/2nQ4/3q2B1/Np1bB2n/p2NP3/R1Pk1p2/1R3K2 w - - 0 1)
Andrade, Barry Jack da Costa
The Observer, 1929
(First published on Sun Apr 14 1929)
#2
10 + 8
| 15239 | Valois Notebooks | 2018 |
SOLUTION
- SOUND
- Sets
- 1...Qb3
- 2.exd4#
- 1...Qc4
- 2.exd4#
- 1...Qe6
- 2.exd4#
- 1...Qa5
- 2.c3#
- 1...Qb5
- 2.c3#
- 1...Qc5
- 2.c3#
- 1...Qe5
- 2.c3#
- 1...Qf5
- 2.c3#
- 1...Qxd6
- 2.c3#
- 1...Bxe3
- 2.c4#
- 1...Bc5
- 2.c4#
- 1...Bb6
- 2.c4#
- 1...Ba7
- 2.c4#
- 1...Se5
- 2.exd4#
- 1...Qb3
- Tries
- 1.Qg3?
- threat
- 2.Qxf2#
- 1...Qf5
- 2.c3#
- 1...Qf7!
- threat
- 1.Qxb4+?
- 1...Bc3
- 2.Qxc3#
- 1...Sxb4!
- 1...Bc3
- 1.Qf4?
- threat
- 2.Qxf2#
- 2.exd4#
- 1...Qxa2
- 2.Qxf2#
- 1...Qxe4
- 2.Qxf2#
- 1...Qxg5
- 2.Qxf2#
- 2.c3#
- 1...Bxe3
- 2.Qxe3#
- 2.Qxf2#
- 2.c4#
- 1...Bb2
- 2.Qxf2#
- 1...Qe5
- 2.Qxf2#
- 2.c3#
- 1...Qf5
- 2.c3#
- 1...Qd6
- 2.Qxf2#
- 2.c3#
- 1...Ba1
- 2.Qxf2#
- 1...Bc3
- 2.Qxf2#
- 1...Bc5
- 2.Qxf2#
- 2.c4#
- 1...Be5
- 2.Qxf2#
- 1...Bb6
- 2.Qxf2#
- 2.c4#
- 1...Bf6
- 2.Qxf2#
- 1...Ba7
- 2.Qxf2#
- 2.c4#
- 1...Bg7
- 2.Qxf2#
- 1...Bh8
- 2.Qxf2#
- 1...Sg2
- 2.Qxf2#
- 1...Sf3
- 2.exd4#
- 1...Sf5
- 2.Qxf2#
- 1...Sg6
- 2.Qxf2#
- 1...Qf7!
- threat
- 1.Qg3?
- Keys
- 1.Se5!
- threat
- 2.exd4#
- 1...Qc4+
- 2.Sxc4#
- 1...Qb5+
- 2.c4#
- 1...Qxe4
- 2.Sc4#
- 1...Qxe5
- 2.c3#
- 2.c4#
- 1...Bxe3
- 2.Sc4#
- 2.c3#
- 2.c4#
- 1...Bxe5
- 2.c3#
- 1...Qb3
- 2.cxb3#
- 1...Qf7
- 2.c4#
- 1...Qg8
- 2.c4#
- 1...Ba1
- 2.Sc4#
- 1...Bb2
- 2.Sc4#
- 1...Bc3
- 2.Sc4#
- 1...Bc5
- 2.Sc4#
- 2.c3#
- 2.c4#
- 1...Bb6
- 2.Sc4#
- 2.c3#
- 2.c4#
- 1...Ba7
- 2.Sc4#
- 2.c3#
- 2.c4#
- 1...Sg2
- 2.Sf3#
- 1...Sf3
- 2.Sxf3#
- 1...Sf5
- 2.Sf3#
- 1...Sg6
- 2.Sf3#
- threat
- 1.Se5!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 3
- ADDED MATES = 11
- REMOVED MATES = 11
- Sets
- Q(g);N_GUARD::B(I)+P(F),XB(e)
- Q(g);N_GUARD,P_PINS(E)::B(I)+P(F),XB(e)
- Q(g);N_GUARD::R(C)+P(D)
- Q(g);N_GUARD,P_PINS(E)::R(C)+P(D)
- Q(g);N_GUARD,XQ(J)::R(C)+P(D)
- B(e);N_GUARD,P_SPINB(e),XP(F)::R(C)+P(D)
- B(e);N_GUARD::R(C)+P(D)
- S(h);S_CUTQ(g)::B(I)+P(F),XB(e)
- Tries
- Try
- Q(J);
- Threat
- QAR2(J),XP(b)
- Vars
- Q(g);N_GUARD::R(C)+P(D)
- Refutation
- Q(g);
- Try
- Q(J);CHECK,XP(d)
- Vars
- B(e);N_GUARD,P_SPINB(e)::QAB1(J),XB(e)
- Refutation
- S(h);XQ(J)
- Try
- Q(J);
- Threat
- DUALS(2)
- Vars
- Q(g);XR(C)::QAR2(J),XP(b)
- Q(g);XB(H)::QAR2(J),XP(b)
- B(e);::QAR2(J),XP(b)
- Q(g);N_GUARD::R(C)+P(D)
- S(f);::QAR2(J),XP(b)
- S(f);::QAB(J)+P(F),XB(e)
- Refutation
- Q(g);
- Try
- Actual
- S(E);
- Threat
- B(I)+P(F),XB(e)
- Vars
- Q(g);CHECK,N_GUARD,P_SPINB(e)::S(E),XQ(g)
- Q(g);CHECK,P_SPINB(e)::R(C)+P(D)
- Q(g);N_GUARD,P_SPINB(e),XB(H)::S(E)
- B(e);P_SPINQ(g),XS(E)::R(C)+P(D)
- Q(g);OGATE,P_SPINB(e)::R(C)+P(D),XQ(g)
- Q(g);P_SPINB(e)::R(C)+P(D)
- B(e);P_SPINQ(g)::S(E)
- S(f);N_GUARD::S(E)
- S(f);N_GUARD::S(E),XS(f)
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