MESON Chess Problem Database
Problem Display
PID: 202799 (2N5/1p1Q1p2/1p3R2/4pn2/N2Pk3/R1b3P1/2P1nP1K/3B4 w - - 0 1)
Byas, Walter
The Observer, 1950
(First published on Sun Sep 10 1950)
#2
11 + 8
| 15239 | Valois Notebooks | 2020 |
SOLUTION
- SOUND
- Sets
- 1...Kf3
- 2.Qxf5#
- 1...Ba1
- 2.f3#
- 1...Be1
- 2.f3#
- 1...Bb2
- 2.f3#
- 1...Bd2
- 2.f3#
- 1...Bb4
- 2.f3#
- 1...Bxd4
- 2.Qxb7#
- 2.f3#
- 1...Ba5
- 2.f3#
- 1...Sc1
- 2.Sxc3#
- 1...Sg1
- 2.Sxc3#
- 1...Sexd4
- 2.Sxc3#
- 1...Sf4
- 2.Sxc3#
- 1...Se3
- 2.f3#
- 1...exd4
- 2.Qxf5#
- 1...Kf3
- Tries
- 1.Sxc3+?
- 1...Kf3
- 2.Qxf5#
- 1...Sxc3!
- 1...Kf3
- 1.Sc5+?
- 1...Kf3
- 2.Qxf5#
- 1...bxc5!
- 1...Kf3
- 1.Bxe2?
- threat
- 2.Sxc3#
- 1...Bxd4
- 2.Bf3#
- 2.Qxb7#
- 2.f3#
- 1...exd4
- 2.Qxf5#
- 1...Ba1
- 2.Bf3#
- 2.f3#
- 1...Be1
- 2.Bf3#
- 2.f3#
- 1...Bb2
- 2.Bf3#
- 2.f3#
- 1...Bd2
- 2.Bf3#
- 2.f3#
- 1...Bb4
- 2.Bf3#
- 2.f3#
- 1...Ba5
- 2.Bf3#
- 2.f3#
- 1...Sd6!
- threat
- 1.Rxf5?
- 1...Bxd4
- 2.f3#
- 1...Sxg3
- 2.Sxc3#
- 2.Bf3#
- 1...Sxd4
- 2.Sxc3#
- 1...exd4
- 2.Sd6#
- 2.Qd5#
- 1...Ba1
- 2.Re3#
- 2.Rxe5#
- 2.f3#
- 1...Be1
- 2.Re3#
- 2.Rxe5#
- 2.f3#
- 1...Bb2
- 2.Re3#
- 2.Rxe5#
- 2.f3#
- 1...Bd2
- 2.Rxe5#
- 2.f3#
- 1...Bb4
- 2.Re3#
- 2.Rxe5#
- 2.f3#
- 1...Ba5
- 2.Re3#
- 2.Rxe5#
- 2.f3#
- 1...Sc1
- 2.Sxc3#
- 2.Bf3#
- 2.Rxe5#
- 1...Sg1
- 2.Sxc3#
- 2.Rxe5#
- 1...Sf4
- 2.Sxc3#
- 2.Rxe5#
- 1...b5
- 2.Sc5#
- 1...f6!
- 1...Bxd4
- 1.Qxf5+?
- 1...Kxd4
- 2.Qd3#
- 1...Kd5!
- 1...Kxd4
- 1.Sxc3+?
- Keys
- 1.Qb5!
- 1...Kf3
- 2.Qxe2#
- 1...Kxd4
- 2.Qd3#
- 1...Bxd4
- 2.f3#
- 1...Sexg3
- 2.Qxe5#
- 1...Sexd4
- 2.Sxc3#
- 1...Sfxg3
- 2.Qxe5#
- 1...Sfxd4
- 2.Sd6#
- 1...exd4
- 2.Qxf5#
- 1...Ba1
- 2.Qxe5#
- 1...Be1
- 2.Qxe5#
- 1...Bb2
- 2.Qxe5#
- 1...Bd2
- 2.Qxe5#
- 1...Bb4
- 2.Qxe5#
- 1...Ba5
- 2.Qxe5#
- 1...Sc1
- 2.Qxe5#
- 1...Sg1
- 2.Qxe5#
- 1...Sf4
- 2.Qxe5#
- 1...Se3
- 2.Qxe5#
- 1...Sh4
- 2.Qxe5#
- 1...Sd6
- 2.Qxe5#
- 1...Sh6
- 2.Qxe5#
- 1...Se7
- 2.Qxe5#
- 1...Sg7
- 2.Qxe5#
- 1...Kf3
- 1.Qb5!
FEATURES
- Static
- TYPE = INCOMPLETE_BLOCK
- CHANGED MATES = 11
- ADDED MATES = 10
- REMOVED MATES = 0
- Sets
- K(c);P_SPINB(b),P_SPINS(a),S_FLIGHT::QAR2(J),XS(e)
- B(b);::P(C)
- S(a);N_GUARD::S(G),XB(b)
- S(a);N_GUARD,XP(H)::S(G),XB(b)
- S(e);SBLOCK::P(C)
- P(d);SBLOCK,XP(H)::QAB1(J),XS(e)
- Tries
- Try
- S(G);CHECK,XB(b)
- Vars
- K(c);P_SPINS(a),S_FLIGHT::QAR2(J),XS(e)
- Refutation
- S(a);XS(G)
- Try
- S(G);CHECK
- Vars
- K(c);P_SPINB(b),P_SPINS(a),S_FLIGHT::QAR2(J),XS(e)
- Refutation
- P(f);XS(G)
- Try
- B(A);XS(a)
- Threat
- S(G),XB(b)
- Vars
- P(d);SBLOCK,XP(H)::QAB1(J),XS(e)
- Refutation
- S(e);
- Try
- R(I);XS(e)
- Vars
- B(b);XP(H)::P(C)
- S(a);N_GUARD,XP(H)::S(G),XB(b)
- P(f);N_GUARD::S(G)
- Refutation
- P(h);
- Try
- Q(J);CHECK,XS(e)
- Vars
- K(c);OGATE,P-FLIGHT,XP(H)::QAR1(J)
- Refutation
- K(c);P_SPINP(d),S_FLIGHT
- Try
- Actual
- Q(J);
- Vars
- K(c);P_SPINB(b),P_SPINS(a),S_FLIGHT::QAB1(J),XS(a)
- K(c);P-FLIGHT,XP(H)::QAR1(J)
- B(b);SBLOCK,XP(H)::P(C)
- S(a);XP(F)::QAR1(J),XP(d)
- S(a);N_GUARD,SBLOCK,XP(H)::S(G),XB(b)
- S(e);XP(F)::QAR1(J),XP(d)
- S(e);N_GUARD,SBLOCK,XP(H)::S(K)
- P(d);OGATE,SBLOCK,XP(H)::QAB1(J),XS(e)
- B(b);::QAR1(J),XP(d)
- S(a);::QAR1(J),XP(d)
- S(e);::QAR1(J),XP(d)
Developed and maintained by Brian Stephenson.
Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) &
CSS/Javascript (jQuery, Bootstrap & DataTables).