MESON Chess Problem Database
Problem Display
PID: 232699 (3B1N2/2p5/3k3K/1p4R1/2qN4/1Q1p4/8/2R5 w - - 0 1)
Frohlich, Georg
Freie Presse, 1971
#2
7 + 5
| 15148 | Sadier Collection | 2021 |
SOLUTION
- SOUND
- Sets
- 1...Qxb3
- 2.Rc6#
- 1...Qd5
- 2.Rxd5#
- 2.Qxd5#
- 1...Qe6+
- 2.Qxe6#
- 1...Qf7
- 2.Sxb5#
- 2.Rc6#
- 1...Qg8
- 2.Sxb5#
- 2.Rc6#
- 1...Qxc1
- 2.Qd5#
- 2.Qe6#
- 1...Qc2
- 2.Rd5#
- 2.Qd5#
- 2.Qe6#
- 1...Qc3
- 2.Rd5#
- 2.Qd5#
- 2.Qe6#
- 1...Qa4
- 2.Rc6#
- 2.Rd5#
- 2.Qd5#
- 2.Qe6#
- 1...Qb4
- 2.Rc6#
- 2.Rd5#
- 2.Qd5#
- 2.Qe6#
- 1...Qxd4
- 2.Qe6#
- 1...Qc5
- 2.Qe6#
- 1...Qc6
- 2.Rxc6#
- 2.Qe6#
- 1...d2
- 2.Qg3#
- 1...Qxb3
- Tries
- 1.Sxb5+?
- 1...Qxb5
- 2.Qe6#
- 1...Kc6!
- 1...Qxb5
- 1.Qa2?
- threat
- 2.Qh2#
- 1...Qe6+
- 2.Qxe6#
- 1...Qxa2
- 2.Sxb5#
- 2.Rc6#
- 1...Qxc1
- 2.Qd5#
- 2.Qe6#
- 1...Qxd4
- 2.Qe6#
- 1...Qf7
- 2.Sxb5#
- 2.Rc6#
- 1...Qd5
- 2.Rxd5#
- 2.Qxd5#
- 1...Qc2
- 2.Rd5#
- 2.Qd5#
- 2.Qe6#
- 1...Qc5
- 2.Qe6#
- 1...d2!
- threat
- 1.Qxc4?
- threat
- 2.Sxb5#
- 2.Rd5#
- 2.Qd5#
- 2.Qe6#
- 2.Qc5#
- 2.Qc6#
- 2.Qxc7#
- 1...b4
- 2.Sb5#
- 2.Rd5#
- 2.Qd5#
- 2.Qe6#
- 2.Qc5#
- 2.Qc6#
- 2.Qxc7#
- 1...c5
- 2.Rd5#
- 2.Qd5#
- 2.Qe6#
- 2.Qxc5#
- 1...c6
- 2.Qe6#
- 2.Qc5#
- 2.Qxc6#
- 1...bxc4!
- threat
- 1.Qa3+?
- 1...Qb4
- 2.Sxb5#
- 2.Rc6#
- 1...Qc5
- 2.Qxc5#
- 1...c5
- 2.Qa6#
- 1...b4!
- 1...Qb4
- 1.Qb4+?
- 1...Qxb4
- 2.Rc6#
- 1...Qc5
- 2.Qxc5#
- 1...c5!
- 1...Qxb4
- 1.Qxb5?
- threat
- 2.Sf5#
- 2.Qd7#
- 2.Qe5#
- 1...Qxb5
- 2.Sxb5#
- 1...Qxd4
- 2.Rc6#
- 2.Qc6#
- 2.Qd7#
- 1...Qf7
- 2.Rc6#
- 2.Qc6#
- 2.Qc5#
- 2.Qe5#
- 1...Qd5
- 2.Rxd5#
- 2.Qd7#
- 2.Qxd5#
- 1...Qa4
- 2.Sf5#
- 2.Rc6#
- 2.Rd5#
- 2.Rg6#
- 2.Qc5#
- 2.Qd5#
- 2.Qe5#
- 1...Qc5
- 2.Qd7#
- 2.Qxc5#
- 1...Qc6
- 2.Sf5#
- 2.Rxc6#
- 2.Rg6#
- 2.Qxc6#
- 2.Qe5#
- 1...c5
- 2.Qc6#
- 2.Qd7#
- 2.Qb6#
- 2.Qb8#
- 1...c6
- 2.Sf5#
- 2.Qe5#
- 2.Qb8#
- 1...Qe6+!
- threat
- 1.Sxb5+?
- Keys
- 1.Qxd3!
- threat
- 2.Qg3#
- 1...Qe6+
- 2.Sdxe6#
- 1...Qxd3
- 2.Rc6#
- 1...Qxc1
- 2.Qg6#
- 1...Qxd4
- 2.Qxd4#
- 1...Qf7
- 2.Sxb5#
- 2.Sde6#
- 2.Rc6#
- 1...Qb3
- 2.Sxb3#
- 2.Sxb5#
- 2.Rc6#
- 1...Qd5
- 2.Sxb5#
- 1...Qc3
- 2.Qg6#
- 1...Qc5
- 2.Qg6#
- threat
- 1.Qxd3!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 3
- ADDED MATES = 4
- REMOVED MATES = 2
- Sets
- Q(b);OGATE,XQ(B)::R1(A)
- Q(b);CHECK,OGATE::QAR1(B),XQ(b)
- Q(b);OGATE,XS(C)::QAR1(B)
- Q(b);OGATE::QAR1(B)
- P(a);OGATE::QAB(B)
- Tries
- Try
- S(C);CHECK,XP(c)
- Vars
- Q(b);OGATE,XS(C)::QAR1(B)
- Refutation
- K(d);P-FLIGHT,P_SPINQ(b)
- Try
- Q(B);
- Threat
- QAB(B)
- Vars
- Q(b);CHECK,OGATE::QAR1(B),XQ(b)
- Q(b);OGATE,XS(C)::QAR1(B)
- Q(b);OGATE::QAR1(B)
- Refutation
- P(a);
- Try
- Q(B);XQ(b)
- Threat
- DUALS(7)
- Refutation
- P(c);XQ(B)
- Try
- Q(B);CHECK
- Vars
- Q(b);N_GUARD,P_SPINQ(b)::QAB1(B),XQ(b)
- P(e);N_GUARD,P_SPINP(e),S_CUTQ(b)::QAR(B)
- Refutation
- P(c);P_SPINP(c)
- Try
- Q(B);CHECK
- Vars
- Q(b);OGATE,XQ(B)::R1(A)
- Q(b);N_GUARD,P_SPINQ(b)::QAB1(B),XQ(b)
- Refutation
- P(e);P_SPINP(e)
- Try
- Q(B);XP(c)
- Threat
- DUALS(3)
- Vars
- Q(b);XQ(B)::S(C),XQ(b)
- Refutation
- Q(b);CHECK
- Try
- Actual
- Q(B);XP(a)
- Threat
- QAB(B)
- Vars
- Q(b);CHECK,N_GUARD::QAR(B)+S(C),XQ(b)
- Q(b);OGATE,XQ(B)::R1(A)
- Q(b);N_GUARD,P_PINR(D),XR(A)::QAR(B)
- Q(b);OGATE,P_SPINQ(b),XS(C)::QAR2(B),XQ(b)
- Q(b);::S(C),XP(c)
- Q(b);N_GUARD::QAR(B)
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).