Here's the BWT output CM compression comparison, version 2.

o1rc9f added:

• rc_sh2f bitwise 32-bit arithmetic coder added, but didn't change anything, so the planned implementation of 64-bit coder was cancelled;
• Node2i update tables are now generated at runtime, and static tables which were used before had been removed... still this allowed to win only 50 bytes on calgary;
• mixer limit masks were expanded (another -100 bytes);
• some minor Node2i update modifications and a lot of various reformatting which didn't affect the compression.

• adding run-lengths to mixer contexts failed (adding it to counter contexts failed earlier);
• using the o1rc9f for ranking and additional order0 for coding (secondary model)... not exactly failed, but its results were too pitiful to try adding it to the mix or something;
• another order0 submodel was added and mixed with other two order0's before the mix with order1, but then it was turned into order1 by optimizer, and after tuning it shows better results than the order2 coder... Most funny thing though, is that this new order1 submodel is so "fast", that it practically assigns all the probability to the LES (last encountered symbol) in the context. And that looks like another proof of bitwise coding inefficiency at this type of data... guess its really the time to start writing an unary bytewise coder.

Note that the best BWT results on world95.txt from maximumcompression.com seem to be 467793 from UHBC and 457426 from M03.

Also paq8o6 -7 compresses calgary_bwt to 772989 and calgary_rbwt to 771273, so there're clearly some possibilities for improvement as paq8's preprocessing tricks don't apply to BWT output, and its highly improbable that order3+ contexts can be of any help.

o1rc8	mix(o0',mix(o0,mix(o1',o1)))	793254
o1rc8a	o1rc8 with parameters tuned to world95.bwt	792668
o1rc9	mix(mix(o1,o1'),mix(o0,o0')), tuned to calgary.tar.bwt	787211
o1rc9a	improved version	785782
o1rc9b	cleaned o1rc9a, tuned to calgary.tar.rbwt	785643
o1rc9f	further cosmetic changes	785456
o1rc9g	mix(mix(mix(o1,o1'),o1''),mix(o0,o0'))	784037
o2rcA	mix(o2,mix(mix(o1,o1'),mix(o0,o0')))<.b>	784956
o2rcA1	cleaned o2rcA, tuned to calgary.tar.rbwt	784684

calgary	calgary.tar
calgary.seg	segmented with Shkarin's seg_file (default level)
calgary.bwt	using BWT.cpp
calgary_rbwt	byte reverse + BWT
calgary_dc1	Binder's DC 0.99.307: dc -a -d calgary calgary_dc1
calgary_dc2	dc -d calgary calgary_dc2 (BWT + all filters enabled, but coding disabled)
calgary_dc2	dc -a -d +feodxlb calgary calgary_dc3 (BWT + all filters enabled, but coding disabled)
calgary_seg_bwt	seg_file + BWT.cpp + separate compression + rar -m0 archive
calgary_seg_rbwt	seg_file + reverse + BWT.cpp + separate compression + rar -m0 archive
calgary_seg_dc1	seg_file + DC's BWT + separate compression + rar -m0 archive
calgary_seg_dc2	seg_file + DC's BWT&filters + separate compression + rar -m0 archive
world95	world95.txt
book1	from calgary.tar
wcc386	wcc386.exe

Coder:	source	bcm002	fpaq0pv4B	o1rc8	o1rc8a	o1rc9	o1rc9a	o1rc9b	o1rc9f	o1rc9g	o2rcA	o2rcA1
BOOK1	768771	212672	441300	350899	351415	348405	350784	350205	350079	350014	349041	348794
BOOK1_bwt	768771		243630	212418	212308	211708	211614	211586	211393	211172	211267	211256
BOOK1_dc1	768860		242948	212364	212310	211398	211419	211348	211137	210992	211021	210963
BOOK1_dc2	544443		238980	205887	205687	205383	206673	206191	206268	206011	205687	205511
BOOK1_dc3	772091		237730	206519	206467	205660	205476	205424	205253	205101	205148	205117
BOOK1_rbwt	768771		242878	212300	212215	211299	211341	211267	211047	210908	210937	210871
BOOK1_seg_bwt	768984		243838	212631	212545	211931	211808	211787	211599	211374	211472	211461
BOOK1_seg_dc1	769153		243198	212583	212552	211612	211611	211541	211331	211188	211219	211158
BOOK1_seg_dc2	544736		239216	206149	205951	205608	206883	206404	206484	206226	205907	205729
BOOK1_seg_dc3	772405		237972	206830	206720	205894	205688	205638	205468	205323	205360	205332
BOOK1_seg_rbwt	768989		243096	212507	212392	211521	211536	211464	211252	211115	211133	211075
calgary	3152896	791434	1680338	1259218	1262575	1249383	1255225	1254212	1254275	1254908	1251319	1250665
calgary_bwt	3152896		981490	795650	794616	789541	787668	787842	787756	786387	786639	786809
calgary_dc1	3152994		981060	793969	793145	787908	786499	786381	786177	784772	785662	785394
calgary_dc2	2778210		996936	799444	798445	793799	794435	793650	793798	791925	792893	792723
calgary_dc3	3167109		975626	789337	788501	783530	782035	781934	781720	780359	781275	781033
calgary_rbwt	3152896		979796	793254	792668	787211	785782	785643	785456	784037	784956	784684
calgary_seg_bwt	3154474		971622	769050	768648	764586	763643	763543	763290	761969	762460	762437
calgary_seg_dc1	3155863		971390	767789	767292	762935	762464	762199	761838	760626	761131	761041
calgary_seg_dc2	2156735		948284	743547	742888	739230	740469	739322	739346	737745	738293	737770
calgary_seg_dc3	3157830		965844	762759	762001	757623	756979	756744	756477	755277	755808	755548
calgary_seg_rbwt	3154511		970564	766977	766433	762086	761693	761426	761067	759872	760401	760247
wcc386	536624	282718	400420	303075	305538	305179	305572	305706	305827	306622	305067	306063
wcc386_bwt	536624		315546	282822	282616	281931	281598	281570	281584	281117	281388	281427
wcc386_dc1	536702		315300	282203	282055	281333	281063	281009	280902	280470	280821	280725
wcc386_dc2	551470		315098	272417	272113	270794	270676	270603	270549	270014	270468	270348
wcc386_dc3	536707		315304	282208	282002	281338	281068	281015	280907	280474	280825	280730
wcc386_rbwt	536624		315256	282120	281949	281278	281013	280959	280852	280419	280771	280675
wcc386_seg_bwt	537152		308582	277535	277529	276998	276671	276600	276562	276138	276433	276499
wcc386_seg_dc1	537604		308470	277154	277179	276702	276384	276313	276203	275817	276122	276043
wcc386_seg_dc2	524852		308180	268315	268098	267051	266862	266782	266695	266169	266644	266586
wcc386_seg_dc3	536938		308684	277369	277384	276914	276597	276526	276411	276020	276319	276243
wcc386_seg_rbwt	537165		308200	276950	276919	276449	276146	276078	275963	275575	275882	275802
world95	2988578	474298	1862146	1333942	1340040	1321571	1318986	1319200	1319125	1317509	1310936	1310059
world95_bwt	2988578		648752	478050	475989	471773	472751	472760	472574	471879	471968	472046
world95_dc1	2988672		647194	476701	474654	470068	470739	470707	470571	469832	469969	470201
world95_dc2	2339029		639862	462754	461250	456848	458155	457734	457757	456537	457287	457026
world95_dc3	2852581		637804	466585	464540	460243	460761	460781	460619	459917	460153	460282
world95_rbwt	2988578		647124	476693	474635	469909	470578	470522	470390	469640	469820	470046
world95_seg_bwt	2989034		667084	482645	480699	476495	477246	477266	477089	476399	476383	476516
world95_seg_dc1	2989415		665804	481004	478954	474361	474856	474836	474716	473918	474105	474336
world95_seg_dc2	2360995		661318	469762	468428	463915	465021	464589	464605	463347	464075	463753
world95_seg_dc3	2854179		656426	470939	468962	464738	465086	465103	464926	464205	464383	464558
world95_seg_rbwt	2989045		665540	480833	478723	474149	474658	474644	474519	473717	473912	474134