MESON Chess Problem Database
Problem Display
PID: 30652 (8/1N2N3/2r5/3qp2R/QP2kp1K/5R2/6B1/6B1 w - - 0 1)
Loyd, Sam
Detroit Free Press, 1876
#2
9 + 5
| 5206 | Sam Loyd and His Chess Problems | 1913 |
| 3391 | Het Half Pin Thema | 1947 |
SOLUTION
- SOUND
- Sets
- 1...Qd4
- 2.Re3#
- 1...Qc5
- 2.bxc5#
- 1...Qd4
- Tries
- 1.Sc5+?
- 1...Qxc5
- 2.bxc5#
- 1...Rxc5!
- 1...Qxc5
- 1.Sxd5?
- 1...Rc1
- 2.Sf6#
- 1...Rc2
- 2.Sf6#
- 1...Rc3
- 2.Sxc3#
- 2.Sf6#
- 1...Rc4
- 2.Sf6#
- 1...Rc5
- 2.Sf6#
- 1...Ra6
- 2.Sc3#
- 1...Rb6
- 2.Sc3#
- 1...Rd6
- 2.Sc3#
- 1...Re6
- 2.Sc3#
- 1...Rf6
- 2.Sc3#
- 2.Sxf6#
- 1...Rg6
- 2.Sc3#
- 1...Rh6
- 2.Sc3#
- 1...Rc7
- 2.Sf6#
- 1...Rc8
- 2.Sf6#
- 1...Kxd5!
- 1...Rc1
- 1.Sxc6?
- threat
- 2.Re3#
- 1...Qxc6
- 2.Qxc6#
- 1...Qd8+!
- threat
- 1.Rxf4+?
- 1...Kxf4
- 2.Sxd5#
- 2.Rf5#
- 1...Kd3!
- 1...Kxf4
- 1.Qc2+?
- 1...Qd3
- 2.Qxd3#
- 1...Rxc2!
- 1...Qd3
- 1.Qb5?
- threat
- 2.Qe2#
- 2.Qxd5#
- 1...Qa2
- 2.Rxe5#
- 2.Qd3#
- 2.Qxe5#
- 1...Qb3
- 2.Rxe5#
- 2.Qxe5#
- 1...Qc4
- 2.Rxe5#
- 2.Qxe5#
- 1...Qe6
- 2.Qe2#
- 2.Qd3#
- 1...Qf7
- 2.Rxe5#
- 2.Qe2#
- 2.Qd3#
- 2.Qxe5#
- 1...Qg8
- 2.Rxe5#
- 2.Qe2#
- 2.Qd3#
- 2.Qxe5#
- 1...Qd1
- 2.Rxe5#
- 2.Qxe5#
- 1...Qd2
- 2.Rxe5#
- 2.Qxe5#
- 1...Qd3
- 2.Rxe5#
- 2.Qxd3#
- 2.Qxe5#
- 1...Qd4
- 2.Re3#
- 1...Qc5
- 2.Qd3#
- 1...Qd6
- 2.Qe2#
- 1...Qd7
- 2.Rxe5#
- 2.Qe2#
- 2.Qxe5#
- 1...Qd8
- 2.Rxe5#
- 2.Qe2#
- 2.Qxe5#
- 1...Rc2
- 2.Qxd5#
- 1...Rc3
- 2.Qxd5#
- 1...Rc4
- 2.Qxd5#
- 1...Rc5
- 2.Qe2#
- 1...Rd6
- 2.Qe2#
- 1...Qxb5!
- threat
- 1.Qa1?
- threat
- 2.Re3#
- 2.Qe1#
- 1...Qa2
- 2.Re3#
- 2.Rxe5#
- 2.Qxe5#
- 1...Qb3
- 2.Re3#
- 2.Rxe5#
- 2.Qxe5#
- 1...Qc4
- 2.Re3#
- 2.Rxe5#
- 2.Qxe5#
- 1...Qd1
- 2.Re3#
- 2.Rxe5#
- 2.Qxe5#
- 1...Qd2
- 2.Re3#
- 2.Rxe5#
- 2.Qxe5#
- 1...Qd3
- 2.Re3#
- 2.Rxe5#
- 2.Qxe5#
- 1...Qd4
- 2.Re3#
- 1...Qb5
- 2.Re3#
- 1...Qc5
- 2.Re3#
- 1...Rc1
- 2.Re3#
- 1...Rc2
- 2.Re3#
- 1...Rc3!
- threat
- 1.Sc5+?
- Keys
- 1.Qa8!
- 1...Qa2
- 2.Sc5#
- 2.Sd6#
- 1...Qb3
- 2.Sc5#
- 2.Sd6#
- 1...Qc4
- 2.Sd6#
- 1...Qe6
- 2.Sc5#
- 1...Qf7
- 2.Sc5#
- 2.Sd6#
- 1...Qg8
- 2.Sc5#
- 2.Sd6#
- 1...Qd1
- 2.Sc5#
- 1...Qd2
- 2.Sc5#
- 1...Qd3
- 2.Sc5#
- 1...Qd4
- 2.Re3#
- 1...Qa5
- 2.Sd6#
- 1...Qb5
- 2.Sd6#
- 1...Qc5
- 2.Sxc5#
- 1...Qd6
- 2.Sxd6#
- 1...Qd7
- 2.Sc5#
- 1...Qd8
- 2.Sc5#
- 1...Rc1
- 2.Sd6#
- 1...Rc2
- 2.Sd6#
- 1...Rc3
- 2.Sd6#
- 1...Rc4
- 2.Sd6#
- 1...Rc5
- 2.Sxc5#
- 2.Sd6#
- 1...Ra6
- 2.Sc5#
- 1...Rb6
- 2.Sc5#
- 1...Rd6
- 2.Sc5#
- 2.Sxd6#
- 1...Re6
- 2.Sc5#
- 1...Rf6
- 2.Sc5#
- 1...Rg6
- 2.Sc5#
- 1...Rh6
- 2.Sc5#
- 1...Rc7
- 2.Sd6#
- 1...Rc8
- 2.Sd6#
- 1...Qa2
- 1.Qa8!
FEATURES
- Static
- TYPE = INCOMPLETE_BLOCK
- CHANGED MATES = 1
- ADDED MATES = 22
- REMOVED MATES = 0
- Sets
- Q(c);SBLOCK::B(B)+R(C),DCHECK
- Q(c);OGATE::QAR(D)+P(E),XQ(c)
- Tries
- Try
- S(H);CHECK
- Vars
- Q(c);OGATE,XS(H)::QAR(D)+P(E),XQ(c)
- Refutation
- R(e);XS(H)
- Try
- S(I);XQ(c)
- Vars
- R(e);N_GUARD::S(I)
- R(e);N_GUARD,P_PINR(G)::S(I)
- Refutation
- K(a);P_SPINP(d),S_FLIGHT,XS(I)
- Try
- S(I);XR(e)
- Threat
- B(B)+R(C),DCHECK
- Vars
- Q(c);OGATE,XS(I)::QAB(D),XQ(c)
- Refutation
- Q(c);CHECK
- Try
- R(C);CHECK,XP(b)
- Refutation
- K(a);S_FLIGHT
- Try
- Q(D);CHECK
- Vars
- Q(c);N_GUARD,P_SPINQ(c)::QAB1(D),XQ(c)
- Refutation
- R(e);XQ(D)
- Try
- Q(D);
- Threat
- DUALS(2)
- Vars
- Q(c);SBLOCK::B(B)+R(C),DCHECK
- Q(c);N_GUARD::QAB1(D)
- Q(c);::QAR2(D)
- R(e);::QAB1(D),XQ(c)
- R(e);::QAR2(D)
- Refutation
- Q(c);XQ(D)
- Try
- Q(D);
- Threat
- DUALS(2)
- Vars
- Q(c);::B(B)+R(C),DCHECK
- R(e);::B(B)+R(C),DCHECK
- Refutation
- R(e);
- Try
- Actual
- Q(D);
- Vars
- Q(c);N_GUARD,S_CUTR(e)::S(H)
- Q(c);SBLOCK::B(B)+R(C),DCHECK
- Q(c);N_GUARD,S_CUTR(e)::S(H),XQ(c)
- Q(c);N_GUARD,P_PINS(I),S_CUTR(e)::S(H)
- R(e);N_GUARD,S_CUTQ(c)::S(H)
- R(e);N_GUARD,P_PINR(G),S_CUTQ(c)::S(H)
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).