MESON Chess Problem Database
Problem Display
PID: 260789 (2K5/pN3Q2/1bB1R3/r1P5/n1k1p3/Pp1R3q/1PP5/8 w - - 0 1)
Johner, Hans
Neue Zurcher Zeitung, 1940
#2
10 + 8
| 6490 | yacpdb | 2022 |
SOLUTION
- SOUND
- Sets
- 1...Qf1
- 2.Rxe4#
- 2.Rf6#
- 1...Qg2
- 2.Rxe4#
- 2.Re5#
- 2.Red6#
- 2.Rf6#
- 2.Rg6#
- 2.Rh6#
- 2.Re7#
- 2.Re8#
- 1...Qxe6+
- 2.Qxe6#
- 1...Qh1
- 2.Rxe4#
- 2.Re5#
- 2.Red6#
- 2.Rf6#
- 2.Rg6#
- 2.Rh6#
- 2.Re7#
- 2.Re8#
- 1...Qh2
- 2.Rxe4#
- 2.Re5#
- 2.Red6#
- 2.Rf6#
- 2.Rg6#
- 2.Rh6#
- 2.Re7#
- 2.Re8#
- 1...Qxd3
- 2.Rxe4#
- 1...Qe3
- 2.Rxe4#
- 2.Re5#
- 2.Red6#
- 2.Rf6#
- 2.Rg6#
- 2.Rh6#
- 2.Re7#
- 2.Re8#
- 1...Qf3
- 2.Rxe4#
- 2.Rf6#
- 1...Qg3
- 2.Rxe4#
- 2.Re5#
- 2.Red6#
- 2.Rf6#
- 2.Rg6#
- 2.Rh6#
- 2.Re7#
- 2.Re8#
- 1...Qh4
- 2.Rxe4#
- 2.Re5#
- 2.Red6#
- 2.Rf6#
- 2.Rg6#
- 2.Rh6#
- 2.Re7#
- 2.Re8#
- 1...Qh5
- 2.Rxe4#
- 1...Qh6
- 2.Rxe4#
- 2.Rf6#
- 2.Rg6#
- 2.Rxh6#
- 1...Qh7
- 2.Rxe4#
- 1...Qh8+
- 2.Re8#
- 1...Rb5
- 2.Bd5#
- 1...Rxc5
- 2.Sd6#
- 1...Bxc5
- 2.Sxa5#
- 1...Sxc5
- 2.Sd6#
- 1...exd3
- 2.Qf4#
- 1...e3
- 2.Qf4#
- 1...Qf1
- Tries
- 1.Sxa5+?
- 1...Kxc5
- 2.Rd5#
- 2.Qe7#
- 2.Qf8#
- 1...Bxa5!
- 1...Kxc5
- 1.Rc3+?
- 1...Kd4
- 2.Qf6#
- 2.Qd7#
- 2.Qg7#
- 1...Qxc3
- 2.Rxe4#
- 2.Rd6#
- 1...Sxc3!
- 1...Kd4
- 1.Rd7?
- threat
- 2.Rxe4#
- 1...Qh8+
- 2.Re8#
- 1...Qxe6
- 2.Qxe6#
- 2.Qf1#
- 1...e3
- 2.Re4#
- 2.Qf4#
- 1...Sxb2!
- threat
- 1.Qf1?
- threat
- 2.cxb3#
- 1...Qxe6+
- 2.Rd7#
- 1...Qh8+
- 2.Rd8#
- 1...Qxf1
- 2.Rxe4#
- 1...Qxd3
- 2.Rxe4#
- 1...Sxc5
- 2.Sd6#
- 1...bxc2
- 2.b3#
- 1...exd3
- 2.Qf4#
- 1...Rb5
- 2.Bd5#
- 1...Sc3!
- threat
- 1.Sxa5+?
- Keys
- 1.Rxh3!
- threat
- 2.Rxe4#
- 2.Rd6#
- 1...Kd4
- 2.Rxe4#
- 1...Rxc5
- 2.Rxe4#
- 1...Sxc5
- 2.Rxe4#
- 1...Sc3
- 2.Rxe4#
- 1...e3
- 2.Rh4#
- 2.Re4#
- 2.Rd6#
- 2.Qf4#
- threat
- 1.Rxh3!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 2
- ADDED MATES = 2
- REMOVED MATES = 9
- Sets
- Q(b);CHECK,OGATE,P_SPINQ(b),XR(G)::QAB(I),XQ(b)
- Q(b);N_PINR(G),XR(D)::QAB(I)+R(G),DCHECK,XP(e)
- Q(b);N_PINR(G)::QAB(I)+R(G),DCHECK,XP(e)
- Q(b);CHECK,N_PINR(G)::QAB(I)+R(G)
- R(f);SBLOCK::B(F)
- R(f);P_PINB(F),SBLOCK,XP(E)::S(H)
- B(g);N_GUARD,SBLOCK,XP(E)::S(H),XR(f)
- S(c);SBLOCK,XP(E)::S(H)
- P(e);OGATEB,XR(D)::QAR(I)
- P(e);OGATEB::QAR(I)
- Tries
- Try
- S(H);CHECK,XR(f)
- Refutation
- B(g);XS(H)
- Try
- R(D);CHECK
- Refutation
- S(c);XR(D)
- Try
- R(D);N_SPINR(G)
- Threat
- QAB(I)+R(G),DCHECK,XP(e)
- Vars
- Q(b);CHECK,N_GUARD::QAB(I)+R(G)
- Refutation
- S(c);XP(A)
- Try
- Q(I);
- Threat
- P(B),XP(a)
- Vars
- Q(b);CHECK,N_GUARD,XR(G)::QAB(I)+R(D)
- Q(b);CHECK,N_GUARD,N_PINR(G)::QAB(I)+R(D)
- Q(b);N_PINR(G),XQ(I)::R(G),XP(e)
- Q(b);N_PINR(G),P_SPINQ(b),XR(D)::R(G),XP(e)
- S(c);SBLOCK,XP(E)::S(H)
- P(a);OGATE,XP(B)::P(A)
- P(e);OGATEB,P_SPINP(e),XR(D)::QAR(I)
- R(f);SBLOCK::B(F)
- Refutation
- S(c);
- Try
- Actual
- R(D);N_SPINR(G),XQ(b)
- Threat
- DUALS(2)
- Vars
- K(d);P-FLIGHT::R1(G),XP(e)
- R(f);P_PINB(F),XP(E)::QAB(I)+R(G),DCHECK,XP(e)
- S(c);XP(E)::QAB(I)+R(G),DCHECK,XP(e)
- S(c);::QAB(I)+R(G),DCHECK,XP(e)
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).