MESON Chess Problem Database
Problem Display
PID: 233187 (K1Bn1Bq1/1p2b3/p4N2/4k1P1/3Rp3/4Pn2/8/5Qr1 w - - 0 1)
Keller, Michael
Freie Presse, 2007
#2
8 + 9
| 15148 | Sadier Collection | 2021 |
SOLUTION
- SOUND
- Sets
- 1...Qd5
- 2.Rxd5#
- 1...Qh7
- 2.Rd5#
- 1...Qg6
- 2.Rd5#
- 1...Qg7
- 2.Rd5#
- 1...Qxf8
- 2.Rd5#
- 1...Qh8
- 2.Rd5#
- 1...Rxf1
- 2.Sg4#
- 1...Rh1
- 2.Sg4#
- 1...Rg4
- 2.Sxg4#
- 1...Ba3
- 2.Rxe4#
- 1...Bb4
- 2.Rxe4#
- 1...Bc5
- 2.Rxe4#
- 1...Bd6
- 2.Bxd6#
- 2.Rxe4#
- 1...Bxf6
- 2.Bd6#
- 1...Se1
- 2.Qf4#
- 2.Qf5#
- 1...Sd2
- 2.Qf4#
- 2.Qf5#
- 1...Sh2
- 2.Qf4#
- 2.Qf5#
- 1...Sxd4
- 2.Qf4#
- 1...Sh4
- 2.Qf4#
- 1...Sxg5
- 2.Qf4#
- 2.Qf5#
- 1...Se6
- 2.Rd5#
- 1...Sf7
- 2.Rd5#
- 1...Qd5
- Tries
- 1.Bxe7?
- threat
- 2.Bd6#
- 2.Rxe4#
- 1...Qxg5
- 2.Rxe4#
- 2.Rd5#
- 1...Rxg5
- 2.Rxe4#
- 1...Sxd4
- 2.Qf4#
- 1...Sxg5
- 2.Bd6#
- 2.Qf4#
- 2.Qf5#
- 1...Se6
- 2.Rd5#
- 1...Qc4
- 2.Bd6#
- 1...Qd5
- 2.Rxd5#
- 1...Qh7
- 2.Bd6#
- 2.Rd5#
- 1...Qg6
- 2.Bd6#
- 2.Rd5#
- 1...Qf8
- 2.Rxe4#
- 2.Rd5#
- 1...Rg4
- 2.Sxg4#
- 2.Bd6#
- 1...Sd2
- 2.Bd6#
- 2.Qf4#
- 2.Qf5#
- 1...Sf7
- 2.Rxe4#
- 2.Rd5#
- 1...Qe6!
- threat
- 1.Bg7?
- threat
- 2.Sg4#
- 1...Qxg7
- 2.Rd5#
- 1...Bxf6
- 2.Bxf6#
- 1...Sxd4
- 2.Qf4#
- 1...Qd5
- 2.Rxd5#
- 1...Se6
- 2.Rd5#
- 1...Rg4
- 2.Sxg4#
- 1...Qe6!
- threat
- 1.Qb5+?
- 1...Qd5
- 2.Rxd5#
- 2.Qxd5#
- 1...Bc5
- 2.Bd6#
- 2.Rxe4#
- 1...axb5!
- 1...Qd5
- 1.Qxf3?
- threat
- 2.Qxe4#
- 2.Qf4#
- 2.Qf5#
- 1...Qxg5
- 2.Rd5#
- 1...Rxg5
- 2.Qf4#
- 1...Qd5
- 2.Rxd5#
- 2.Qf4#
- 1...Qe6
- 2.Qxe4#
- 2.Qf4#
- 1...Qh7
- 2.Rd5#
- 2.Qf4#
- 1...Qg6
- 2.Rd5#
- 2.Qf4#
- 1...Rf1
- 2.Sg4#
- 2.Qxe4#
- 1...Rg4
- 2.Sxg4#
- 2.Qf5#
- 1...Se6
- 2.Sd7#
- 2.Rd5#
- 2.Qxe4#
- 1...exf3!
- threat
- 1.Bxe7?
- Keys
- 1.Qa1!
- threat
- 2.Rd5#
- 1...Rxa1
- 2.Sg4#
- 1...Bxf6
- 2.Bd6#
- 1...Sxd4
- 2.Qxd4#
- 1...Qd5
- 2.Rxd5#
- threat
- 1.Qa1!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 1
- ADDED MATES = 1
- REMOVED MATES = 14
- Sets
- Q(i);N_GUARD::R1(C),XQ(i)
- Q(i);N_GUARD::R1(C)
- Q(i);N_GUARD,XB(H)::R1(C)
- R(a);N_GUARD,XQ(A)::S(E)
- R(a);N_GUARD::S(E)
- R(a);N_GUARD::S(E),XR(a)
- B(g);::R1(C),XP(c)
- B(g);OGATE,XS(E)::B(H)
- S(b);OGATE,XR(C)::QAB1(A)
- S(b);OGATE::QAB1(A)
- S(h);S_CUTQ(i)::R1(C)
- Tries
- Try
- B(H);XB(g)
- Threat
- DUALS(2)
- Vars
- R(a);XP(D)::R1(C),XP(c)
- S(b);OGATE,XR(C)::QAB1(A)
- S(h);P_PINB(G),S_CUTQ(i)::R1(C)
- Q(i);::B(H)
- Q(i);N_GUARD::R1(C),XQ(i)
- Refutation
- Q(i);
- Try
- B(H);
- Threat
- B(H)+S(E),DCHECK
- Vars
- Q(i);N_GUARD,XB(H)::R1(C)
- B(g);OGATE,P_SPINB(g),XS(E)::B(H),XB(g)
- S(b);OGATE,XR(C)::QAB1(A)
- Q(i);N_GUARD::R1(C),XQ(i)
- S(h);P_PINB(G),S_CUTQ(i)::R1(C)
- R(a);::B(H)+S(E),DCHECK,XR(a)
- Refutation
- Q(i);
- Try
- Q(A);CHECK
- Refutation
- P(e);XQ(A)
- Try
- Q(A);XS(b)
- Threat
- DUALS(3)
- Vars
- Q(i);N_GUARD,XP(D)::R1(C)
- R(a);XP(D)::QAB1(A)
- Refutation
- P(c);XQ(A)
- Try
- Actual
- Q(A);
- Threat
- QAB(A)+R(C),DCHECK
- Vars
- R(a);N_GUARD,XQ(A)::S(E)
- B(g);OGATE,XS(E)::B(H)
- S(b);OGATE,P_SPINS(b),XR(C)::QAB1(A),XS(b)
- Q(i);::QAB(A)+R(C),DCHECK,XQ(i)
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).