MESON Chess Problem Database
Problem Display
PID: 79416 (q2n2n1/1pP1R3/pQpN4/K2kP3/b7/N1p2p1B/2PP1r2/b3R1B1 w - - 0 1)
Onkoud, Abdelaziz
Die Schwalbe, 2008
#2
12 + 12
SOLUTION
- SOUND
- Sets
- 1...Rf1
- 2.Qd4#
- 2.Qc5#
- 1...Rxd2
- 2.Qc5#
- 1...Re2
- 2.Qd4#
- 2.Qc5#
- 1...Rg2
- 2.Qd4#
- 2.Qc5#
- 1...Rh2
- 2.Qd4#
- 2.Qc5#
- 1...Se6
- 2.Bxe6#
- 1...Sf7
- 2.Be6#
- 1...cxd2
- 2.c4#
- 1...Rf1
- Tries
- 1.Se4?
- threat
- 2.Qc5#
- 1...Re2
- 2.Qd4#
- 1...c5
- 2.Qxc5#
- 2.Qd6#
- 1...Qa7
- 2.cxd8Q#
- 2.cxd8R#
- 1...Se6!
- threat
- 1.Sdb5?
- threat
- 2.Rd7#
- 2.Qd4#
- 1...Rxd2
- 2.Rd7#
- 2.Qc5#
- 1...Bxb5
- 2.Rd7#
- 1...Sxe7
- 2.Qd4#
- 1...cxd2
- 2.Rd7#
- 2.c4#
- 1...cxb5
- 2.Rd7#
- 2.Qd6#
- 1...Re2
- 2.Qd4#
- 1...Qa7
- 2.Rd7#
- 2.cxd8Q#
- 2.cxd8R#
- 1...Qc8
- 2.Qd4#
- 1...Se6
- 2.Bxe6#
- 2.Rd7#
- 1...Sf7
- 2.Be6#
- 2.Qd4#
- 1...Sf6
- 2.Qd4#
- 1...c5
- 2.Rd7#
- 2.Qd6#
- 1...axb5+!
- threat
- 1.Sxb7?
- threat
- 2.Rd7#
- 2.Qc5#
- 1...Qxb7
- 2.Rd7#
- 1...Sxe7
- 2.Qc5#
- 1...Re2
- 2.Qd4#
- 1...c5
- 2.Qxc5#
- 2.Qd6#
- 1...Qa7
- 2.Rd7#
- 2.cxd8Q#
- 2.cxd8R#
- 1...Qc8
- 2.Qc5#
- 1...Se6
- 2.Bxe6#
- 2.Rd7#
- 1...Sf7
- 2.Be6#
- 2.Qc5#
- 1...Sf6
- 2.Qc5#
- 1...Sxb7+!
- threat
- 1.Se8?
- threat
- 2.Rd7#
- 1...Sxe7
- 2.Sf6#
- 1...Re2
- 2.Qd4#
- 1...c5
- 2.Qd6#
- 1...Sf7
- 2.Be6#
- 1...Sf6
- 2.Sxf6#
- 1...Qc8!
- threat
- 1.Bxf2?
- threat
- 2.Qd4#
- 2.Qc5#
- 1...cxd2
- 2.Qc5#
- 2.c4#
- 1...Se6
- 2.Bxe6#
- 1...c5
- 2.Qxc5#
- 1...Qa7!
- threat
- 1.Re4?
- threat
- 2.Rd4#
- 2.Qd4#
- 1...Rxd2
- 2.Qc5#
- 1...Sxe7
- 2.Qd4#
- 1...cxd2
- 2.c4#
- 1...Qa7
- 2.Rd4#
- 1...Se6
- 2.Bxe6#
- 1...c5!
- threat
- 1.Rd7?
- threat
- 2.Sdc4#
- 2.Sdb5#
- 2.Sxb7#
- 2.Sf7#
- 2.Sc8#
- 2.Se8#
- 1...Re2
- 2.Qd4#
- 2.Qc5#
- 1...c5
- 2.Sdb5#
- 1...Qc8
- 2.Sxc8#
- 1...Bb5
- 2.Sdc4#
- 2.Sdxb5#
- 2.Sxb7#
- 2.Sf7#
- 2.Sc8#
- 2.Se8#
- 1...Sf7
- 2.Sxf7#
- 1...Sf6!
- threat
- 1.Qxf2?
- threat
- 2.Qd4#
- 2.Qc5#
- 2.Qxf3#
- 1...Bxc2
- 2.Qd4#
- 2.Qc5#
- 1...cxd2
- 2.Qc5#
- 2.Qxf3#
- 2.c4#
- 1...c5
- 2.Qxc5#
- 2.Qxf3#
- 1...Qa7
- 2.Qxf3#
- 1...Se6
- 2.Bxe6#
- 2.Qxf3#
- 1...Sf6
- 2.Qd4#
- 2.Qc5#
- 1...b6+!
- threat
- 1.Qb3+?
- 1...Kd4
- 2.Bxf2#
- 2.Qc4#
- 1...Kc5
- 2.Bxf2#
- 2.Qc4#
- 1...Bxb3!
- 1...Kd4
- 1.d4?
- threat
- 2.Qc5#
- 1...c5
- 2.Qxc5#
- 1...Se6
- 2.Bxe6#
- 1...Qa7!
- threat
- 1.cxd8Q?
- threat
- 2.Sc8#
- 2.Be6#
- 1...Qxd8
- 2.Be6#
- 1...Sxe7
- 2.Sc8#
- 1...Qb8
- 2.Be6#
- 1...Qc8
- 2.Sxc8#
- 1...Re2
- 2.Qd4#
- 2.Qc5#
- 1...Sf6
- 2.Be6#
- 1...c5!
- threat
- 1.cxd8R?
- threat
- 2.Sc8#
- 2.Be6#
- 1...Qxd8
- 2.Be6#
- 1...Sxe7
- 2.Sc8#
- 1...Qc8
- 2.Sxc8#
- 1...Qb8
- 2.Be6#
- 1...Re2
- 2.Qd4#
- 2.Qc5#
- 1...Sf6
- 2.Be6#
- 1...c5!
- threat
- 1.Se4?
- Keys
- 1.Sf5!
- threat
- 2.Qd4#
- 1...Rxd2
- 2.Qc5#
- 1...Sxe7
- 2.Sxe7#
- 1...cxd2
- 2.c4#
- 1...Qa7
- 2.cxd8Q#
- 2.cxd8R#
- 1...Se6
- 2.Rd7#
- 1...c5
- 2.Qd6#
- threat
- 1.Sf5!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 1
- ADDED MATES = 2
- REMOVED MATES = 1
- Sets
- R(b);XP(D)::QAR1(I)
- S(k);N_GUARD::B(F),XS(k)
- S(k);N_GUARD::B(F)
- P(c);OGATE,XP(D)::P(C)
- Tries
- Try
- S(J);
- Threat
- QAR1(I)
- Vars
- R(b);::QAR1(I)
- Q(j);N_GUARD::PXS(k)=Q
- Refutation
- S(k);
- Try
- S(J);
- Threat
- DUALS(2)
- Vars
- B(e);XS(J)::R(L)
- S(l);XR(L)::QAR1(I)
- R(b);::QAR1(I)
- Q(j);::QAR1(I)
- S(l);::QAR1(I)
- Refutation
- P(g);CHECK,XS(J)
- Try
- S(J);XP(i)
- Threat
- DUALS(2)
- Vars
- Q(j);XS(J)::R(L)
- S(l);XR(L)::QAR1(I)
- R(b);::QAR1(I)
- Q(j);::QAR1(I)
- S(l);::QAR1(I)
- Refutation
- S(k);CHECK,XS(J)
- Try
- S(J);
- Threat
- R(L)
- Vars
- S(l);N_GUARD,XR(L)::S(J)
- R(b);::QAR1(I)
- P(h);OGATE::QAR1(I)
- S(k);N_GUARD::B(F)
- S(l);N_GUARD::S(J),XS(l)
- Refutation
- Q(j);
- Try
- B(B);XR(b)
- Threat
- DUALS(2)
- Vars
- S(k);N_GUARD::B(F),XS(k)
- P(h);::QAR1(I),XP(h)
- Refutation
- Q(j);
- Try
- R(A);
- Threat
- DUALS(2)
- Vars
- R(b);XP(D)::QAR1(I)
- S(l);XR(L)::QAR1(I)
- P(c);OGATE,XP(D)::P(C)
- Q(j);::R1(A)
- S(k);N_GUARD::B(F),XS(k)
- Refutation
- P(h);
- Try
- R(L);
- Threat
- DUALS(6)
- Vars
- P(h);::R(L)+S(J)
- Q(j);::R(L)+S(J),XQ(j)
- S(k);::R(L)+S(J),XS(k)
- Refutation
- S(l);
- Try
- Q(I);XR(b)
- Threat
- DUALS(3)
- Vars
- Q(j);::QAB(I),XP(d)
- Refutation
- P(i);CHECK
- Try
- Q(I);CHECK
- Refutation
- B(e);XQ(I)
- Try
- P(D);
- Threat
- QAR1(I)
- Vars
- P(h);::QAR1(I),XP(h)
- S(k);N_GUARD::B(F),XS(k)
- Refutation
- Q(j);
- Try
- P(K);XS(k)
- Threat
- DUALS(2)
- Vars
- Q(j);P_PINQ(I),XQ(K)::B(F)
- S(l);XR(L)::QAR(K)+S(J)
- Q(j);::B(F)
- Q(j);::QAR(K)+S(J),XQ(j)
- S(l);::B(F)
- Refutation
- P(h);
- Try
- P(K);XS(k)
- Threat
- DUALS(2)
- Vars
- Q(j);P_PINQ(I),XR(K)::B(F)
- S(l);XR(L)::R(K)+S(J)
- Q(j);::R(K)+S(J),XQ(j)
- Q(j);::B(F)
- S(l);::B(F)
- Refutation
- P(h);
- Try
- Actual
- S(J);
- Threat
- QAR1(I)
- Vars
- R(b);XP(D)::QAR1(I)
- S(l);XR(L)::S(J),XS(l)
- P(c);OGATE,XP(D)::P(C)
- Q(j);N_GUARD::PXS(k)=Q
- S(k);SBLOCK::R(L)
- P(h);OGATE::QAR1(I)
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