MESON Chess Problem Database
Problem Display
PID: 205147 (3n4/3N4/4pp2/p4b1R/B1P1kp2/1N2p3/1p1BQ3/bK6 w - - 0 1)
Sprague, Gordon
The Observer, 1952
(First published on Sun Oct 19 1952)
#2
8 + 10
| 15239 | Valois Notebooks | 2020 |
SOLUTION
- SOUND
- Sets
- 1...Bh3
- 2.Sdc5#
- 2.Sxf6#
- 1...Bg4
- 2.Sdc5#
- 2.Sxf6#
- 1...Bg6
- 2.Sdc5#
- 2.Sxf6#
- 1...Bh7
- 2.Sdc5#
- 2.Sxf6#
- 1...Sc6
- 2.Bxc6#
- 1...Sb7
- 2.Bc6#
- 1...Sf7
- 2.Bc6#
- 1...f3
- 2.Qxe3#
- 1...e5
- 2.Sdc5#
- 2.Sxf6#
- 1...Bh3
- Tries
- 1.Be1?
- 1...Bh3
- 2.Sdc5#
- 2.Sxf6#
- 1...Bg4
- 2.Sdc5#
- 2.Sxf6#
- 1...Bg6
- 2.Sdc5#
- 2.Sxf6#
- 1...Bh7
- 2.Sdc5#
- 2.Sxf6#
- 1...Sc6
- 2.Bxc6#
- 1...Sb7
- 2.Bc6#
- 1...Sf7
- 2.Bc6#
- 1...e5
- 2.Sdc5#
- 2.Sxf6#
- 1...f3!
- 1...Bh3
- 1.Bc3?
- threat
- 2.Sd2#
- 2.Sbc5#
- 2.Sdc5#
- 2.Sxf6#
- 1...Sb7
- 2.Sd2#
- 2.Sxf6#
- 2.Bc6#
- 1...f3!
- threat
- 1.Bxe3?
- threat
- 2.Sd2#
- 2.Sbc5#
- 2.Bc1#
- 2.Bg1#
- 2.Bd2#
- 2.Bf2#
- 2.Bd4#
- 2.Bc5#
- 2.Bb6#
- 2.Ba7#
- 1...Bg4
- 2.Sd2#
- 2.Sbc5#
- 2.Sdc5#
- 2.Sxf6#
- 1...Sb7
- 2.Sd2#
- 2.Bc1#
- 2.Bg1#
- 2.Bd2#
- 2.Bf2#
- 2.Bd4#
- 2.Bc5#
- 2.Bb6#
- 2.Ba7#
- 2.Bc6#
- 1...f3
- 2.Sd2#
- 2.Sbc5#
- 1...fxe3!
- threat
- 1.Bxa5?
- 1...Bh3
- 2.Sdc5#
- 2.Sxf6#
- 1...Bg4
- 2.Sdc5#
- 2.Sxf6#
- 1...Bg6
- 2.Sdc5#
- 2.Sxf6#
- 1...Bh7
- 2.Sdc5#
- 2.Sxf6#
- 1...Sc6
- 2.Bxc6#
- 1...Sb7
- 2.Bc6#
- 1...Sf7
- 2.Bc6#
- 1...e5
- 2.Sdc5#
- 2.Sxf6#
- 1...f3!
- 1...Bh3
- 1.Bb5?
- 1...f3
- 2.Qxe3#
- 1...Bh3
- 2.Sdc5#
- 2.Sxf6#
- 1...Bg4
- 2.Sdc5#
- 2.Sxf6#
- 1...Bg6
- 2.Sdc5#
- 2.Sxf6#
- 1...Bh7
- 2.Sdc5#
- 2.Sxf6#
- 1...Sc6
- 2.Bxc6#
- 1...Sb7
- 2.Bc6#
- 1...Sf7
- 2.Bc6#
- 1...e5
- 2.Sdc5#
- 2.Sxf6#
- 1...a4!
- 1...f3
- 1.Rg5?
- 1...f3
- 2.Qxe3#
- 1...Bh3
- 2.Sdc5#
- 2.Sxf6#
- 1...Bg4
- 2.Sdc5#
- 2.Sxf6#
- 1...Bg6
- 2.Sdc5#
- 2.Sxf6#
- 1...Bh7
- 2.Sdc5#
- 2.Sxf6#
- 1...Sc6
- 2.Bxc6#
- 1...Sb7
- 2.Bc6#
- 1...Sf7
- 2.Bc6#
- 1...e5
- 2.Sdc5#
- 2.Sxf6#
- 1...fxg5!
- 1...f3
- 1.Qf1?
- 1...exd2
- 2.Qe2#
- 1...e2
- 2.Qxe2#
- 1...Bh3
- 2.Sdc5#
- 2.Sxf6#
- 1...Bg4
- 2.Sdc5#
- 2.Sxf6#
- 1...Bg6
- 2.Sdc5#
- 2.Sxf6#
- 1...Bh7
- 2.Sdc5#
- 2.Sxf6#
- 1...Sc6
- 2.Bxc6#
- 1...Sb7
- 2.Bc6#
- 1...Sf7
- 2.Bc6#
- 1...e5
- 2.Sdc5#
- 2.Sxf6#
- 1...f3!
- 1...exd2
- 1.Be1?
- Keys
- 1.c5!
- 1...Kd5+
- 2.Qd3#
- 1...f3
- 2.Qc4#
- 1...Bh3
- 2.Sxf6#
- 1...Bg4
- 2.Sxf6#
- 1...Bg6
- 2.Sxf6#
- 1...Bh7
- 2.Sxf6#
- 1...Sc6
- 2.Bxc6#
- 1...Sb7
- 2.Bc6#
- 1...Sf7
- 2.Bc6#
- 1...e5
- 2.Sxf6#
- 1...Kd5+
- 1.c5!
FEATURES
- Static
- TYPE = MUTATE
- CHANGED MATES = 1
- ADDED MATES = 6
- REMOVED MATES = 0
- Sets
- S(j);N_GUARD::B(E),XS(j)
- S(j);N_GUARD::B(E)
- P(e);N_GUARD::QAR1(C),XP(c)
- Tries
- Try
- B(B);
- Vars
- S(j);N_GUARD::B(E),XS(j)
- S(j);N_GUARD::B(E)
- Refutation
- P(e);
- Try
- B(B);
- Threat
- DUALS(4)
- Refutation
- P(e);
- Try
- B(B);XP(c)
- Threat
- DUALS(10)
- Refutation
- P(e);P_SPINP(e),XB(B)
- Try
- B(B);XP(f)
- Vars
- S(j);N_GUARD::B(E),XS(j)
- S(j);N_GUARD::B(E)
- Refutation
- P(e);
- Try
- B(E);
- Vars
- P(e);N_GUARD::QAR1(C),XP(c)
- S(j);N_GUARD::B(E),XS(j)
- S(j);N_GUARD::B(E)
- Refutation
- P(f);
- Try
- R(G);
- Vars
- P(e);N_GUARD::QAR1(C),XP(c)
- S(j);N_GUARD::B(E),XS(j)
- S(j);N_GUARD::B(E)
- Refutation
- P(i);XR(G)
- Try
- Q(C);N_PINP(c)
- Vars
- P(c);OGATEB,XB(B)::QAR2(C)
- P(c);OGATEB::QAR2(C),XP(c)
- S(j);N_GUARD::B(E),XS(j)
- S(j);N_GUARD::B(E)
- Refutation
- P(e);
- Try
- Actual
- P(F);
- Vars
- K(d);CHECK,N_SPINP(c),P_SPINB(g),S_FLIGHT::QAR2(C)
- P(e);SBLOCK::QAR2(C)
- B(g);::S(H),XP(i)
- S(j);N_GUARD::B(E),XS(j)
- S(j);N_GUARD::B(E)
- P(h);SBLOCK::S(H),XP(i)
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