MESON Chess Problem Database
Problem Display
PID: 245345 (n3N1K1/1R2pP2/2R3Q1/1PBkp3/B2n2b1/1PpPp3/6q1/2rNr3 w - - 0 1)
Onkoud, Abdelaziz
Schweizerische Schachzeitung, 2009
#2
12 + 11
| 15148 | Sadier Collection | 2021 |
SOLUTION
- SOUND
- Sets
- 1...Qf1
- 2.Qe4#
- 1...Qh3
- 2.Qe4#
- 1...Qe4
- 2.Qxe4#
- 2.dxe4#
- 1...Qg1
- 2.Qe4#
- 1...Qa2
- 2.Qe4#
- 1...Qb2
- 2.Qe4#
- 1...Qc2
- 2.Qe4#
- 1...Qd2
- 2.Qe4#
- 1...Qe2
- 2.Qe4#
- 1...Qf2
- 2.Qe4#
- 1...Qh2
- 2.Qe4#
- 1...Qg3
- 2.Qe4#
- 1...Ra1
- 2.Sxc3#
- 1...Rb1
- 2.Sxc3#
- 1...Rf1
- 2.Sxe3#
- 1...Rg1
- 2.Sxe3#
- 1...Rh1
- 2.Sxe3#
- 1...Bxd1
- 2.Rd7#
- 1...Be2
- 2.Sxe3#
- 2.Rd7#
- 1...Bf3
- 2.Rd7#
- 1...Bh5
- 2.Rd7#
- 1...Bd7
- 2.Rxd7#
- 1...Sc2
- 2.Sxc3#
- 1...Se2
- 2.Sxe3#
- 1...Sxb3
- 2.Bxb3#
- 1...Sf3
- 2.Qe4#
- 1...Sf5
- 2.Qe6#
- 1...Sxc6
- 2.Qxc6#
- 1...Se6
- 2.Rd7#
- 1...Sb6
- 2.Sc7#
- 1...Sc7
- 2.Sxc7#
- 1...c2
- 2.Sc3#
- 1...e2
- 2.Se3#
- 1...e6
- 2.Sf6#
- 2.Rd7#
- 1...Qf1
- Tries
- 1.Bb6?
- threat
- 2.Rc5#
- 1...Sxb3
- 2.Bxb3#
- 1...Sxc6
- 2.Qxc6#
- 1...Sxb6
- 2.Sc7#
- 1...Sc2
- 2.Sxc3#
- 1...Se2
- 2.Sxe3#
- 1...Sf3
- 2.Qe4#
- 1...Sf5
- 2.Qe6#
- 1...Se6
- 2.Rd7#
- 1...Sxb5!
- threat
- 1.Rd6+?
- 1...exd6
- 2.Qxd6#
- 1...Kxc5!
- 1...exd6
- 1.Rxe7?
- threat
- 2.Sf6#
- 2.Qd6#
- 1...Bxd1
- 2.Sf6#
- 2.Rd7#
- 1...Sxc6
- 2.Qxc6#
- 2.Qd6#
- 1...Qf1
- 2.Qe4#
- 2.Qd6#
- 1...Qf3
- 2.Qd6#
- 1...Qf2
- 2.Qe4#
- 2.Qd6#
- 1...Rf1
- 2.Sxe3#
- 2.Qd6#
- 1...Be2
- 2.Sxe3#
- 2.Sf6#
- 2.Rd7#
- 1...Bf3
- 2.Sf6#
- 2.Rd7#
- 1...Bh3
- 2.Sf6#
- 1...Bf5
- 2.Sf6#
- 1...Bh5
- 2.Sf6#
- 2.Rd7#
- 1...Be6
- 2.Sf6#
- 1...Bd7
- 2.Sf6#
- 2.Rxd7#
- 1...Bc8
- 2.Sf6#
- 1...Sf5
- 2.Sf6#
- 2.Qe6#
- 1...Se6
- 2.Sf6#
- 2.Rd7#
- 1...Sxb5!
- threat
- 1.Qe6+?
- 1...Sxe6
- 2.Rd7#
- 1...Bxe6+!
- 1...Sxe6
- 1.Bb6?
- Keys
- 1.Ba7!
- threat
- 2.Rc5#
- 1...Sxb3
- 2.Bxb3#
- 1...Sxb5
- 2.Rxb5#
- 1...Sxc6
- 2.Qxc6#
- 1...Sc2
- 2.Sxc3#
- 1...Se2
- 2.Sxe3#
- 1...Sf3
- 2.Qe4#
- 1...Sf5
- 2.Qe6#
- 1...Se6
- 2.Rd7#
- 1...Sb6
- 2.Sc7#
- threat
- 1.Ba7!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 1
- REMOVED MATES = 23
- Sets
- Q(c);N_GUARD::QAB1(H)
- R(a);N_GUARD::S(A),XP(d)
- R(b);N_GUARD::S(A),XP(e)
- B(g);N_GUARD,P_PINQ(H),XS(A)::R(I)
- B(g);N_GUARD,P_PINQ(H)::R(I)
- B(g);N_GUARD,P_PINQ(H)::R(I),XB(g)
- S(f);S_CUTR(a)::S(A),XP(d)
- S(f);S_CUTR(b)::S(A),XP(e)
- S(f);OGATE,XP(B)::B(D),XS(f)
- S(f);S_CUTQ(c)::QAB1(H)
- S(f);N_GUARD,S_CUTB(g)::QAB1(H)
- S(f);OGATE,XR(G)::QAB1(H),XS(f)
- S(f);S_CUTB(g)::R(I)
- S(k);N_GUARD::S(K)
- S(k);N_GUARD::S(K),XS(k)
- P(d);S_CUTR(a)::S(A)
- P(e);S_CUTR(b)::S(A)
- Tries
- Try
- B(F);
- Threat
- R1(G)
- Vars
- S(f);OGATE,XP(B)::B(D),XS(f)
- S(f);OGATE,XR(G)::QAB1(H),XS(f)
- S(k);N_GUARD,XB(F)::S(K)
- S(f);S_CUTR(a)::S(A),XP(d)
- S(f);S_CUTR(b)::S(A),XP(e)
- S(f);S_CUTQ(c)::QAB1(H)
- S(f);N_GUARD,S_CUTB(g)::QAB1(H)
- S(f);S_CUTB(g)::R(I)
- Refutation
- S(f);XP(E)
- Try
- R(G);CHECK
- Vars
- P(j);OGATE,XR(G)::QAR1(H),XP(j)
- Refutation
- K(h);P-FLIGHT,XB(F)
- Try
- R(I);XP(j)
- Threat
- DUALS(2)
- Vars
- Q(c);::QAR1(H)
- B(g);P_PINQ(H)::S(K)
- B(g);P_PINP(J),P_PINQ(H)::S(K)
- Refutation
- S(f);XP(E)
- Try
- Q(H);CHECK
- Vars
- S(f);XQ(H)::R(I)
- Refutation
- B(g);CHECK,P_PINP(J),XQ(H)
- Try
- Actual
- B(F);
- Threat
- R1(G)
- Vars
- S(f);OGATE,XP(B)::B(D),XS(f)
- S(f);OGATE,XP(E)::R(I),XS(f)
- S(f);OGATE,XR(G)::QAB1(H),XS(f)
- S(f);S_CUTR(a)::S(A),XP(d)
- S(f);S_CUTR(b)::S(A),XP(e)
- S(f);S_CUTQ(c)::QAB1(H)
- S(f);N_GUARD,S_CUTB(g)::QAB1(H)
- S(f);S_CUTB(g)::R(I)
- S(k);N_GUARD::S(K)
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).