MESON Chess Problem Database
Problem Display
PID: 1142 (4Q3/4NNpB/7p/3PBP2/r3k1P1/R2Rn2K/6P1/1r3n2 w - - 0 1)
McWilliam, Robert C
Problem Observer, 1985
#2
12 + 7
SOLUTION
- SOUND
- Sets
- 1...Rxa3
- 2.Rd4#
- 1...Rd4
- 2.Rxd4#
- 1...Ra5
- 2.Rd4#
- 1...Ra6
- 2.Rd4#
- 1...Ra7
- 2.Rd4#
- 1...Ra8
- 2.Rd4#
- 1...Sd2
- 2.Rxe3#
- 1...Sh2
- 2.Rxe3#
- 1...Sg3
- 2.Rxe3#
- 1...Sc4
- 2.Rd4#
- 1...Sxf5
- 2.Bxf5#
- 1...Rxa3
- Tries
- 1.Sc6?
- threat
- 2.Sd6#
- 2.Bh2#
- 2.Bg3#
- 2.Bd6#
- 2.Bc7#
- 2.Bb8#
- 1...Rxa3
- 2.Rd4#
- 1...Sxg4
- 2.Sd6#
- 1...Sxd5
- 2.Sd6#
- 1...Rd4
- 2.Rxd4#
- 1...Rb7
- 2.Sd6#
- 2.Bc7#
- 1...Rb8
- 2.Sd6#
- 2.Bxb8#
- 1...Ra7
- 2.Sd6#
- 2.Bc7#
- 2.Rd4#
- 1...Ra8
- 2.Sd6#
- 2.Bb8#
- 2.Rd4#
- 1...Sh2
- 2.Sd6#
- 2.Bxh2#
- 2.Bg3#
- 2.Bd6#
- 2.Bc7#
- 2.Bb8#
- 1...Sg3
- 2.Sd6#
- 2.Bxg3#
- 2.Bd6#
- 2.Bc7#
- 2.Bb8#
- 1...Sc4
- 2.Rd4#
- 1...Rb3!
- threat
- 1.Sc8?
- threat
- 2.Sfd6#
- 2.Scd6#
- 2.Bh2#
- 2.Bg3#
- 2.Bd6#
- 2.Bc7#
- 2.Bb8#
- 1...Rxa3
- 2.Rd4#
- 1...Sxg4
- 2.Sfd6#
- 2.Scd6#
- 1...Sxd5
- 2.Sfd6#
- 2.Scd6#
- 1...Rd4
- 2.Rxd4#
- 1...Rb6
- 2.Bd6#
- 1...Rb7
- 2.Sfd6#
- 2.Scd6#
- 2.Bc7#
- 1...Rb8
- 2.Sfd6#
- 2.Scd6#
- 2.Bh2#
- 2.Bg3#
- 2.Bd6#
- 2.Bc7#
- 2.Bxb8#
- 1...Ra6
- 2.Bd6#
- 2.Rd4#
- 1...Ra7
- 2.Sfd6#
- 2.Scd6#
- 2.Bc7#
- 2.Rd4#
- 1...Sh2
- 2.Sfd6#
- 2.Scd6#
- 2.Bxh2#
- 2.Bg3#
- 2.Bd6#
- 2.Bc7#
- 2.Bb8#
- 1...Sg3
- 2.Sfd6#
- 2.Scd6#
- 2.Bxg3#
- 2.Bd6#
- 2.Bc7#
- 2.Bb8#
- 1...Sc4
- 2.Rd4#
- 1...Rb3!
- threat
- 1.Sg8?
- threat
- 2.Sd6#
- 2.Bh2#
- 2.Bg3#
- 2.Bd6#
- 2.Bc7#
- 2.Bb8#
- 1...Rxa3
- 2.Rd4#
- 1...Sxg4
- 2.Sd6#
- 1...Sxd5
- 2.Sd6#
- 1...Rd4
- 2.Rxd4#
- 1...Rb6
- 2.Bd6#
- 1...Rb7
- 2.Sd6#
- 2.Bc7#
- 1...Rb8
- 2.Sd6#
- 2.Bxb8#
- 1...Ra6
- 2.Bd6#
- 2.Rd4#
- 1...Ra7
- 2.Sd6#
- 2.Bc7#
- 2.Rd4#
- 1...Ra8
- 2.Sd6#
- 2.Bb8#
- 2.Rd4#
- 1...Sh2
- 2.Sd6#
- 2.Bxh2#
- 2.Bg3#
- 2.Bd6#
- 2.Bc7#
- 2.Bb8#
- 1...Sg3
- 2.Sd6#
- 2.Bxg3#
- 2.Bd6#
- 2.Bc7#
- 2.Bb8#
- 1...Sc4
- 2.Rd4#
- 1...Rb3!
- threat
- 1.Qxa4+?
- 1...Sc4
- 2.Rd4#
- 2.Qxc4#
- 1...Rb4!
- 1...Sc4
- 1.f6+?
- 1...Sf5
- 2.Bxf5#
- 1...g6!
- 1...Sf5
- 1.Sc6?
- Keys
- 1.Bb2!
- threat
- 2.Sg6#
- 1...Kf4
- 2.Sg6#
- 1...Rxa3
- 2.Rd4#
- 1...Sxg4
- 2.Qxa4#
- 1...Sxd5
- 2.Sxd5#
- 1...Sxf5
- 2.Qxa4#
- 1...Rd4
- 2.Rxd4#
- 1...Ra6
- 2.Rd4#
- 1...Ra7
- 2.Rd4#
- 1...Ra8
- 2.Rd4#
- 1...Sc4
- 2.Rd4#
- 1...g6
- 2.Sxg6#
- threat
- 1.Bb2!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 1
- ADDED MATES = 4
- REMOVED MATES = 4
- Sets
- R(d);N_GUARD,XR(B)::R1(C)
- R(d);N_GUARD::R1(C),XR(d)
- R(d);N_GUARD::R1(C)
- S(b);N_GUARD::R1(C),XS(c)
- S(c);S_CUTR(d)::R1(C)
- S(c);OGATE,P_SPINS(c),XP(H)::B(K),XS(c)
- Tries
- Try
- S(I);
- Threat
- DUALS(6)
- Vars
- R(d);N_GUARD,XR(B)::R1(C)
- S(c);XP(E)::S(J)
- S(c);XP(F)::S(J)
- R(d);N_GUARD::R1(C),XR(d)
- S(c);S_CUTR(d)::R1(C)
- Refutation
- R(a);
- Try
- S(I);
- Threat
- DUALS(7)
- Vars
- R(d);N_GUARD,XR(B)::R1(C)
- R(d);N_GUARD::R1(C),XR(d)
- R(a);::QAR(L)+B(G)
- S(c);S_CUTR(d)::R1(C)
- Refutation
- R(a);
- Try
- S(I);
- Threat
- DUALS(6)
- Vars
- R(d);N_GUARD,XR(B)::R1(C)
- S(c);XP(E)::S(J)
- S(c);XP(F)::S(J)
- R(d);N_GUARD::R1(C),XR(d)
- R(a);::QAR(L)+B(G)
- S(c);S_CUTR(d)::R1(C)
- Refutation
- R(a);
- Try
- Q(L);CHECK,XR(d)
- Refutation
- R(a);P_SPINR(a)
- Try
- P(H);CHECK
- Vars
- S(c);N_GUARD,P_SPINS(c)::B(K),XS(c)
- Refutation
- P(g);P_SPINP(g)
- Try
- Actual
- B(G);
- Threat
- QAR(L)+S(I)
- Vars
- K(e);P-FLIGHT::S(I)
- R(d);N_GUARD,XR(B)::R1(C)
- S(c);N_GUARD,XP(E)::QAR(L),XR(d)
- S(c);XP(F)::QAR(L)+S(I),XS(c)
- S(c);N_GUARD,P_SPINS(c),XP(H)::QAR(L),XR(d)
- R(d);N_GUARD::R1(C),XR(d)
- R(d);N_GUARD::R1(C)
- S(c);S_CUTR(d)::R1(C)
- P(g);::QAR(L)+S(I),XP(g)
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