MESON Chess Problem Database
Problem Display
PID: 152939 (8/1p3p2/1P3Bn1/5RK1/1Np1k3/3pn1p1/3bR1P1/1Q1N4 w - - 0 1)
Harley, Brian
The Observer, 1934
(First published on Sun Jul 15 1934)
#2
9 + 9
| 15290 | Harley Scrapbook | 2014 |
| 15239 | Valois Notebooks | 2019 |
SOLUTION
- SOUND
- Sets
- 1...Bc1
- 2.Sc3#
- 1...Be1
- 2.Rxe3#
- 1...Bc3
- 2.Sxc3#
- 2.Rxe3#
- 1...Bxb4
- 2.Rxe3#
- 1...Sf4
- 2.Rxf4#
- 1...Sh4
- 2.Rf4#
- 1...Se5
- 2.Rf4#
- 1...Se7
- 2.Rf4#
- 1...Sf8
- 2.Rf4#
- 1...Sh8
- 2.Rf4#
- 1...c3
- 2.Qxd3#
- 1...Bc1
- Tries
- 1.Sc6?
- 1...Se5
- 2.Rxe5#
- 1...Bc1
- 2.Sc3#
- 1...Be1
- 2.Rxe3#
- 1...Bc3
- 2.Sxc3#
- 2.Rxe3#
- 1...Bb4
- 2.Rxe3#
- 1...Ba5
- 2.Rxe3#
- 1...Sf4
- 2.Re5#
- 1...Sh4
- 2.Re5#
- 1...Se7
- 2.Re5#
- 1...Sf8
- 2.Re5#
- 1...Sh8
- 2.Re5#
- 1...c3
- 2.Qb4#
- 1...bxc6!
- 1...Se5
- 1.Bg7?
- 1...Bxb4
- 2.Rxe3#
- 1...Se5
- 2.Rf4#
- 1...Bc1
- 2.Sc3#
- 1...Be1
- 2.Rxe3#
- 1...Bc3
- 2.Sxc3#
- 2.Rxe3#
- 1...Sf4
- 2.Rxf4#
- 1...Sh4
- 2.Rf4#
- 1...Se7
- 2.Rf4#
- 1...Sf8
- 2.Rf4#
- 1...Sh8
- 2.Rf4#
- 1...c3
- 2.Qxd3#
- 1...f6+!
- 1...Bxb4
- 1.Re1?
- 1...Bxb4
- 2.Rxe3#
- 1...Se5
- 2.Rf4#
- 1...Bc1
- 2.Sc3#
- 1...Bc3
- 2.Sxc3#
- 2.Rxe3#
- 1...Sf4
- 2.Rxf4#
- 1...Sh4
- 2.Rf4#
- 1...Se7
- 2.Rf4#
- 1...Sf8
- 2.Rf4#
- 1...Sh8
- 2.Rf4#
- 1...c3
- 2.Qxd3#
- 1...Bxe1!
- 1...Bxb4
- 1.Rf1?
- 1...Se5
- 2.Rf4#
- 1...Bc1
- 2.Sc3#
- 1...Be1
- 2.Rxe3#
- 1...Bc3
- 2.Sxc3#
- 2.Rxe3#
- 1...Sf4
- 2.Rxf4#
- 1...Sh4
- 2.Rf4#
- 1...Se7
- 2.Rf4#
- 1...Sf8
- 2.Rf4#
- 1...Sh8
- 2.Rf4#
- 1...c3
- 2.Qxd3#
- 1...Bxb4!
- 1...Se5
- 1.Rff2?
- 1...gxf2
- 2.Sxf2#
- 1...Se5
- 2.Rf4#
- 1...Bc1
- 2.Sc3#
- 1...Be1
- 2.Rxe3#
- 1...Bc3
- 2.Sxc3#
- 2.Rxe3#
- 1...Sf4
- 2.Rxf4#
- 1...Sh4
- 2.Rf4#
- 1...Se7
- 2.Rf4#
- 1...Sf8
- 2.Rf4#
- 1...Sh8
- 2.Rf4#
- 1...c3
- 2.Qxd3#
- 1...Bxb4!
- 1...gxf2
- 1.Rf3?
- 1...Se5
- 2.Rf4#
- 1...Bc1
- 2.Sc3#
- 1...Be1
- 2.Rexe3#
- 2.Rfxe3#
- 1...Bc3
- 2.Sxc3#
- 2.Rexe3#
- 2.Rfxe3#
- 1...Sf4
- 2.Rxf4#
- 1...Sh4
- 2.Rf4#
- 1...Se7
- 2.Rf4#
- 1...Sf8
- 2.Rf4#
- 1...Sh8
- 2.Rf4#
- 1...c3
- 2.Qxd3#
- 1...Bxb4!
- 1...Se5
- 1.Rc5?
- threat
- 2.Rxc4#
- 1...Bxb4
- 2.Rxe3#
- 1...Bc3
- 2.Sxc3#
- 2.Rxe3#
- 1...c3
- 2.Rc4#
- 2.Qxd3#
- 1...Se5!
- threat
- 1.Rd5?
- threat
- 2.Rd4#
- 1...Bc3
- 2.Sxc3#
- 2.Rxe3#
- 1...Se5!
- threat
- 1.Qa2?
- threat
- 2.Qxc4#
- 1...Se5
- 2.Rf4#
- 1...Bc3
- 2.Sxc3#
- 2.Rxe3#
- 1...c3
- 2.Qc4#
- 2.Qd5#
- 1...dxe2!
- threat
- 1.Qc2?
- threat
- 2.Qxc4#
- 1...Se5
- 2.Rf4#
- 1...Bc3
- 2.Sxc3#
- 2.Rxe3#
- 1...c3
- 2.Qxd3#
- 1...dxc2!
- threat
- 1.Qa1?
- threat
- 2.Qd4#
- 1...Bc3
- 2.Sxc3#
- 2.Rxe3#
- 1...Se5
- 2.Rf4#
- 2.Rxe5#
- 2.Qxe5#
- 1...c3!
- threat
- 1.Qb2?
- threat
- 2.Qd4#
- 1...Bc3
- 2.Sxc3#
- 2.Rxe3#
- 1...Se5
- 2.Rf4#
- 2.Rxe5#
- 2.Qxe5#
- 1...c3!
- threat
- 1.Sc6?
- Keys
- 1.Sc2!
- 1...dxc2
- 2.Qxc2#
- 1...dxe2
- 2.Scxe3#
- 1...Se5
- 2.Rxe5#
- 1...Bc1
- 2.Sc3#
- 1...Be1
- 2.Rxe3#
- 1...Bc3
- 2.Sxc3#
- 2.Rxe3#
- 1...Bb4
- 2.Rxe3#
- 1...Ba5
- 2.Rxe3#
- 1...Sf4
- 2.Re5#
- 1...Sh4
- 2.Re5#
- 1...Se7
- 2.Re5#
- 1...Sf8
- 2.Re5#
- 1...Sh8
- 2.Re5#
- 1...c3
- 2.Qb4#
- 1...dxc2
- 1.Sc2!
FEATURES
- Static
- TYPE = MUTATE
- CHANGED MATES = 7
- ADDED MATES = 3
- REMOVED MATES = 0
- Sets
- B(a);N_GUARD::S(B)
- B(a);N_GUARD::R1(C),XS(c)
- B(a);N_GUARD,XS(E)::R1(C),XS(c)
- S(g);N_GUARD::R1(F),XS(g)
- S(g);N_GUARD::R1(F)
- P(e);N_GUARD::QAB1(A),XP(b)
- Tries
- Try
- S(E);
- Vars
- S(g);N_GUARD::R1(F),XS(g)
- B(a);N_GUARD::S(B)
- B(a);N_GUARD::R1(C),XS(c)
- S(g);N_GUARD::R1(F)
- P(e);OGATEB::QAR(A)
- Refutation
- P(h);XS(E)
- Try
- B(I);
- Vars
- B(a);N_GUARD,XS(E)::R1(C),XS(c)
- S(g);N_GUARD::R1(F)
- B(a);N_GUARD::S(B)
- B(a);N_GUARD::R1(C),XS(c)
- S(g);N_GUARD::R1(F),XS(g)
- P(e);N_GUARD::QAB1(A),XP(b)
- Refutation
- P(i);CHECK
- Try
- R(C);
- Vars
- B(a);N_GUARD,XS(E)::R1(C),XS(c)
- S(g);N_GUARD::R1(F)
- B(a);N_GUARD::S(B)
- S(g);N_GUARD::R1(F),XS(g)
- P(e);N_GUARD::QAB1(A),XP(b)
- Refutation
- B(a);N_SPINS(c),XR(C)
- Try
- R(F);
- Vars
- S(g);N_GUARD::R1(F)
- B(a);N_GUARD::S(B)
- B(a);N_GUARD::R1(C),XS(c)
- S(g);N_GUARD::R1(F),XS(g)
- P(e);N_GUARD::QAB1(A),XP(b)
- Refutation
- B(a);XS(E)
- Try
- R(F);
- Vars
- P(d);XR(F)::S(B),XP(d)
- S(g);N_GUARD::R1(F)
- B(a);N_GUARD::S(B)
- B(a);N_GUARD::R1(C),XS(c)
- S(g);N_GUARD::R1(F),XS(g)
- P(e);N_GUARD::QAB1(A),XP(b)
- Refutation
- B(a);XS(E)
- Try
- R(F);
- Vars
- S(g);N_GUARD::R1(F)
- B(a);N_GUARD::S(B)
- S(g);N_GUARD::R1(F),XS(g)
- P(e);N_GUARD::QAB1(A),XP(b)
- Refutation
- B(a);XS(E)
- Try
- R(F);
- Threat
- R(F),XP(e)
- Vars
- B(a);N_GUARD,XS(E)::R1(C),XS(c)
- Refutation
- S(g);
- Try
- R(F);
- Threat
- R1(F)
- Refutation
- S(g);
- Try
- Q(A);N_PINP(b)
- Threat
- QAR2(A),XP(e)
- Vars
- S(g);N_GUARD::R1(F)
- Refutation
- P(b);N_SPINS(c),XR(C)
- Try
- Q(A);
- Threat
- QAR2(A),XP(e)
- Vars
- S(g);N_GUARD::R1(F)
- P(e);N_GUARD::QAB1(A),XP(b)
- Refutation
- P(b);N_SPINP(b),XQ(A)
- Try
- Q(A);N_PINP(b)
- Threat
- QAR1(A)
- Refutation
- P(e);
- Try
- Q(A);N_PINP(b)
- Threat
- QAR1(A)
- Refutation
- P(e);
- Try
- Actual
- S(E);N_PINP(b)
- Vars
- P(b);OGATE,P_SPINP(b),XS(E)::QAB(A),XP(b)
- P(b);N_SPINS(c),XR(C)::QAB(A)+S(E),XS(c)
- S(g);N_GUARD::R1(F),XS(g)
- B(a);N_GUARD::S(B)
- B(a);N_GUARD::R1(C),XS(c)
- S(g);N_GUARD::R1(F)
- P(e);OGATEB::QAR(A)
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