MESON Chess Problem Database
Problem Display
PID: 255869 (3b4/1Kn1p3/2NRP3/p7/P1k3r1/BN1R1q2/1rP4Q/8 w - - 0 1)
Sammelius, Carel Johan Robert
Die Schwalbe, 1967
#2
10 + 8
SOLUTION
- SOUND
- Sets
- 1...Qd1
- 2.Sxa5#
- 2.Se5#
- 1...Qe2
- 2.Sxa5#
- 1...Qxc6+
- 2.Rxc6#
- 1...Qf1
- 2.Sxa5#
- 2.Se5#
- 1...Qf2
- 2.Sxa5#
- 2.Se5#
- 1...Qe3
- 2.Sxa5#
- 1...Qg3
- 2.Sxa5#
- 1...Qh3
- 2.Sxa5#
- 2.Se5#
- 1...Qf4
- 2.Sxa5#
- 1...Qf6
- 2.Sxa5#
- 1...Qf7
- 2.Sxa5#
- 2.Se5#
- 1...Qf8
- 2.Sxa5#
- 2.Se5#
- 1...Ra2
- 2.Sd2#
- 2.Sxa5#
- 1...Rxc2
- 2.Sxa5#
- 2.Qxc2#
- 1...Rxb3+
- 2.cxb3#
- 1...Rg1
- 2.R6d4#
- 1...Rg2
- 2.R6d4#
- 1...Rg3
- 2.R6d4#
- 1...Rd4
- 2.R6xd4#
- 1...Re4
- 2.Sxa5#
- 1...Rg5
- 2.R6d4#
- 1...Rg6
- 2.R6d4#
- 1...Rg7
- 2.R6d4#
- 1...Rg8
- 2.R6d4#
- 1...Sb5
- 2.Sd2#
- 1...Sd5
- 2.Se5#
- 1...Qd1
- Tries
- 1.Kc8?
- threat
- 2.Sd2#
- 2.Sbxa5#
- 2.Scxa5#
- 2.Se5#
- 1...Qxc6
- 2.Sd2#
- 2.Sxa5#
- 2.Rxc6#
- 1...Rxc2
- 2.Sbxa5#
- 2.Scxa5#
- 2.Se5#
- 2.Qxc2#
- 1...Rxb3
- 2.Sxa5#
- 2.Se5#
- 2.cxb3#
- 1...Sxe6
- 2.Sd2#
- 2.Se5#
- 1...exd6
- 2.Sd2#
- 2.Sbxa5#
- 2.Scxa5#
- 1...Qd1
- 2.Sbxa5#
- 2.Scxa5#
- 2.Se5#
- 1...Qe2
- 2.Sbxa5#
- 2.Scxa5#
- 1...Qg2
- 2.Sbxa5#
- 2.Scxa5#
- 2.Se5#
- 1...Qe4
- 2.Sd2#
- 2.Sbxa5#
- 2.Scxa5#
- 1...Qd5
- 2.Sd2#
- 1...Qf2
- 2.Sbxa5#
- 2.Scxa5#
- 2.Se5#
- 1...Qe3
- 2.Sbxa5#
- 2.Scxa5#
- 1...Qg3
- 2.Sd2#
- 2.Sbxa5#
- 2.Scxa5#
- 1...Qf4
- 2.Sbxa5#
- 2.Scxa5#
- 1...Qf5
- 2.Sd2#
- 1...Qf6
- 2.Sd2#
- 2.Sbxa5#
- 2.Scxa5#
- 1...Rg2
- 2.Sbxa5#
- 2.Scxa5#
- 2.Se5#
- 2.R6d4#
- 1...Re4
- 2.Sd2#
- 2.Sbxa5#
- 2.Scxa5#
- 1...Rg5
- 2.Sd2#
- 2.R6d4#
- 1...Sb5
- 2.Sd2#
- 2.Se5#
- 1...Sd5
- 2.Sd2#
- 2.Se5#
- 1...Sa6
- 2.Sd2#
- 2.Se5#
- 1...Sa8
- 2.Sd2#
- 2.Se5#
- 1...Se8
- 2.Sd2#
- 2.Se5#
- 1...Qxd3!
- threat
- 1.Rxf3?
- threat
- 2.Sxa5#
- 2.Se5#
- 2.Qe2#
- 1...Rxb3+
- 2.cxb3#
- 1...Rxc2
- 2.Sbxa5#
- 2.Scxa5#
- 2.Se5#
- 2.Qxc2#
- 1...Sxe6
- 2.Se5#
- 2.Qe2#
- 1...Rg2
- 2.Sxa5#
- 2.Se5#
- 2.Rd4#
- 2.Qf4#
- 1...Rd4
- 2.Sxa5#
- 2.Se5#
- 2.Rxd4#
- 1...Re4
- 2.Sxa5#
- 1...Rg5
- 2.Rd4#
- 2.Qf4#
- 2.Qe2#
- 1...Sb5
- 2.Sd2#
- 2.Se5#
- 2.Qe2#
- 1...Sd5
- 2.Se5#
- 2.Qe2#
- 1...Sa6
- 2.Se5#
- 2.Qe2#
- 1...Sa8
- 2.Se5#
- 2.Qe2#
- 1...Se8
- 2.Se5#
- 2.Qe2#
- 1...exd6!
- threat
- 1.R3d4+?
- 1...Kc3
- 2.Qd2#
- 1...Rxd4!
- 1...Kc3
- 1.R6d5?
- threat
- 2.Sxa5#
- 2.Se5#
- 2.Rc5#
- 1...Rxb3+
- 2.cxb3#
- 1...Qxd3
- 2.Rc5#
- 1...Rxc2
- 2.Sbxa5#
- 2.Scxa5#
- 2.Se5#
- 2.Qxc2#
- 1...Sxd5
- 2.Se5#
- 1...Sxe6
- 2.Se5#
- 1...Rd4
- 2.R5xd4#
- 2.Rc5#
- 1...Qe2
- 2.Sxa5#
- 2.Rc5#
- 1...Qe4
- 2.Sxa5#
- 2.Rc5#
- 1...Qf2
- 2.Sxa5#
- 2.Se5#
- 1...Qe3
- 2.Sxa5#
- 1...Qg3
- 2.Sxa5#
- 2.Rc5#
- 1...Qf4
- 2.Sxa5#
- 2.Rc5#
- 1...Qf5
- 2.Sxa5#
- 1...Qf6
- 2.Sxa5#
- 2.Rc5#
- 1...Re4
- 2.Sxa5#
- 2.Rc5#
- 1...Rg5
- 2.Sxa5#
- 2.R5d4#
- 1...Sb5
- 2.Sd2#
- 2.Se5#
- 2.Rc5#
- 1...Sa6
- 2.Se5#
- 1...Sa8
- 2.Se5#
- 2.Rc5#
- 1...Se8
- 2.Se5#
- 2.Rc5#
- 1...Qxd5!
- threat
- 1.Qe5?
- threat
- 2.Qc3#
- 2.Qc5#
- 1...Qxc6+
- 2.Rxc6#
- 1...Rxb3+
- 2.cxb3#
- 1...Qxd3
- 2.Sxa5#
- 2.Qc5#
- 1...Rxc2
- 2.Sxa5#
- 2.Qc5#
- 1...Sxe6
- 2.Qc3#
- 2.Qb5#
- 1...exd6
- 2.Qc3#
- 1...Qd5
- 2.Rc3#
- 2.Qc3#
- 1...Qf2
- 2.Sxa5#
- 2.Rc3#
- 2.Qc3#
- 1...Qe3
- 2.Sxa5#
- 2.Qc3#
- 1...Qf5
- 2.Sxa5#
- 2.Rc3#
- 2.Qc3#
- 1...Qf6
- 2.Sxa5#
- 2.Rc3#
- 2.Qc5#
- 1...Rd4
- 2.R6xd4#
- 2.Qxd4#
- 2.Qc5#
- 1...Rg5
- 2.R6d4#
- 2.Qc3#
- 2.Qd4#
- 1...Sb5
- 2.Sd2#
- 2.Qxb5#
- 2.Qc5#
- 1...Sa6
- 2.Qc3#
- 2.Qb5#
- 1...Sd5!
- threat
- 1.Qd2?
- threat
- 2.Qc3#
- 1...Qxc6+
- 2.Rxc6#
- 1...Rxb3+
- 2.cxb3#
- 1...Qxd3
- 2.Sxa5#
- 2.Se5#
- 2.Qxd3#
- 1...Rxc2
- 2.Sxa5#
- 2.Qxc2#
- 1...Qf6
- 2.Sxa5#
- 1...Sd5
- 2.Se5#
- 1...Sb5!
- threat
- 1.Kc8?
- Keys
- 1.Qh8!
- threat
- 2.Qc3#
- 1...Qxc6+
- 2.Rxc6#
- 1...Rxb3+
- 2.cxb3#
- 1...Qxd3
- 2.Sxa5#
- 1...Rxc2
- 2.Sxa5#
- 1...Qf6
- 2.Sxa5#
- 1...Rd4
- 2.R6xd4#
- 2.Qxd4#
- 1...Rg7
- 2.R6d4#
- 1...Sb5
- 2.Sd2#
- 1...Sd5
- 2.Se5#
- threat
- 1.Qh8!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 2
- REMOVED MATES = 12
- Sets
- Q(b);::S(G),XP(e)
- Q(b);CHECK,OGATE,XS(G)::R(H),XQ(b)
- R(a);CHECK,OGATE,P_PINS(G),XS(D)::P(A),XR(a)
- R(d);N_GUARD::R1(H)
- R(d);N_GUARD::R1(H),XR(d)
- R(d);::S(G),XP(e)
- S(f);N_PINS(D),P_PINS(G)::S(D)
- S(f);::S(G)
- Tries
- Try
- K(J);N_SPINS(D),S_FLIGHT
- Threat
- DUALS(4)
- Vars
- Q(b);::S(D)
- Q(b);P_PINP(I)::S(D)
- Refutation
- Q(b);XR(E)
- Try
- R(E);XQ(b)
- Threat
- DUALS(3)
- Vars
- R(a);CHECK,OGATE,XS(D)::P(A),XR(a)
- R(d);::S(G),XP(e)
- Refutation
- P(g);XR(H)
- Try
- R(E);CHECK
- Vars
- K(c);P-FLIGHT,S_CUTR(d)::QAB1(B)
- Refutation
- R(d);XR(E)
- Try
- R(H);
- Threat
- DUALS(3)
- Vars
- R(a);CHECK,OGATE,XS(D)::P(A),XR(a)
- Q(b);XR(E)::R1(H)
- S(f);XR(H)::S(G)
- S(f);XP(I)::S(G)
- Q(b);::S(G),XP(e)
- S(f);::S(G)
- Refutation
- Q(b);XR(H)
- Try
- Q(B);
- Threat
- DUALS(2)
- Vars
- Q(b);CHECK,OGATE,XS(G)::R(H),XQ(b)
- R(a);CHECK,OGATE,P_PINS(G),XS(D)::P(A),XR(a)
- P(g);XR(H)::QAR1(B)
- Refutation
- S(f);
- Try
- Q(B);
- Threat
- QAR1(B)
- Vars
- Q(b);CHECK,OGATE,XS(G)::R(H),XQ(b)
- R(a);CHECK,OGATE,P_PINS(G),XS(D)::P(A),XR(a)
- Q(b);::S(G),XP(e)
- S(f);::S(G)
- Refutation
- S(f);N_PINS(D),P_PINS(G)
- Try
- Actual
- Q(B);
- Threat
- QAR1(B)
- Vars
- Q(b);CHECK,OGATE,XS(G)::R(H),XQ(b)
- R(a);CHECK,OGATE,P_PINS(G),XS(D)::P(A),XR(a)
- Q(b);XR(E)::S(G),XP(e)
- R(a);N_PINS(D),P_PINS(G),XP(A)::S(D),XP(e)
- Q(b);::S(G),XP(e)
- R(d);N_GUARD::R1(H)
- S(f);N_PINS(D),P_PINS(G)::S(D)
- S(f);::S(G)
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).