AB CD EF GH AC BD EG FH AD BC EH FG AE BF CG DH AF BE CH DG AG BH CE DF AH BG CF DE 8 golfers, pairs, 7 rounds AB CD EF GH IJ AC BD EG FI HJ AD BC EJ FG HI AE BF CH DI GJ AF BE CJ DH GI AG BI CE DJ FH AH BG CI DE FJ AJ BH CF DG EI AI BJ CG DF EH 10 golfers, pairs, 9 rounds AB CD EF GH IJ KL AC BD EG FH IK JL AD BC EH FG IL JK AE BF CI DJ GK HL AF BE CJ DI GL HK AK BL CE DF GI HJ AL BK CF DE GJ HI AG BH CK DL EI FJ AH BG CL DK EJ FI AI BJ CG DH EK FL AJ BI CH DG EL FK 12 golfers, pairs, 11 rounds AB CD EF GH IJ KL MN AC BD EG FH IK JM LN AD BC EH FG IN JK LM AE BF CG DH IL JN KM AF BE CH DG IM JL KN AI BJ CE DK FL GM HN AJ BI CK DE FN GL HM AK BM CF DI EJ GN HL AL BN CI DF EM GJ HK AG BK CL DN EI FM HJ AM BG CJ DL EN FK HI AH BL CN DM EK FJ GI AN BH CM DJ EL FI GK 14 golfers, pairs, 13 rounds AB CD EF GH IJ KL MN OP AC BD EG FH IK JL MO NP AD BC EH FG IL JK MP NO AE BF CG DH IM JN KO LP AF BE CH DG IN JM KP LO AG BH CE DF IO JP KM LN AH BG CF DE IP JO KN LM AI BJ CK DL EM FN GO HP AJ BI CL DK EN FM GP HO AK BL CI DJ EO FP GM HN AL BK CJ DI EP FO GN HM AM BN CO DP EI FJ GK HL AN BM CP DO EJ FI GL HK AO BP CM DN EK FL GI HJ AP BO CN DM EL FK GJ HI 16 golfers, pairs, 15 rounds ABC DEF GHI JKL ADG BEJ CHK FIL AHJ BDL CEI FGK AIK BFH CDJ EGL 12 golfers, threesomes, 4 rounds ABC DEF GHI JKL MNO ADG BEJ CFM HKN ILO AEN BDO CHL FIK GJM AIM BGL CDK EHO FJN AHJ BKM CEI DLN FGO AFL BIN CJO DHM EGK AKO BFH CGN DIJ ELM 15 golfers, threesomes, 7 rounds ABC DEF GHI ahf dbi gec Abc Def Ghi aHF dBI gEC abC deF ghI AHf DBi GEc aBc dEf gHi AhF DbI GeC ADG BEH CFI aei bfg cdh Adg Beh Cfi aEI bFG cDH adG beH cfI AEi BFg CDh aDg bEh cFi AeI BfG CdH 18 golfers, threesomes, 8 rounds ABF EGM DKR INP CJT HOU LQS DEJ HIK BNO AQR CLU FMS GPT AHL JKO EIQ CNR BGS DMT FPU BCD FHN ELP GOQ AKT IMU JRS EFK IGL COM BRP AJU DNS HQT BIJ KLM FGR AOP CHS ENT DQU CAE DIO FJQ HMR BLT GNU KPS FDL GHJ AMN CPQ BKU EOS IRT CGK LJN DHP BMQ AIS FOT ERU STU ADG BEH CFI JMP KNQ LOR 21 golfers, threesomes, 10 rounds ABC DEF GHI JKL MNO PQR STU VWX JOT ESB API DML HCV QWN FKU GRX DVK SFO JQI EHL PTG WRC BMU ANX EGM FBV DWI SPL QKA RNT OHU JCX SAH BOG ERI FQL WMJ NCK VPU DTX FJP OVA SNI BWL RHD CTM GQU EKX BDQ VGJ FCI ORL NPE TKH AWU SMX OEW GAD BTI VNL CQS KMP JRU FHX VSR AJE OKI GCL TWF MHQ DNU BPX GFN JDS VMI ATL KRB HPW ECU OQX AFMR BNHJ CPOD EQVT GKSW IXUL 24 golfers play 10 rounds 11 rounds are possible (3-RGDD of type 2^{12}). Also this is an OP(3^8). The following self-explanatory constructions are from Kotzig and Rosa, Nearly Kirkman Systems, Cong Num 10, 1974 (607-614), using TD(3,n). Via KTS(9), NKTS(3(9-1)) exists. YZ+ ABC DEF GHI JKL MNO PQR STU VWX MTR DW+ SLZ ANU VBF EOY GJP IXC HKQ JQO PIZ VKR SWC BLY AT+ DGM FUX EHN SBX KUY JE+ ARZ GTC DHL OFI NQW MPV AHF JNR QCY PK+ GXZ MBI SVD ULO TWE GNL SHO PTX WIY VQ+ MFZ CRU BEK ADJ PWU GB+ VOZ DQX AEI HRY KNT JMS LCF VEC NXY MH+ DUZ JWF GKO PSA RIL QTB DKI MQU TFY SN+ JCZ PEL WBH VAG XOR MEX JTI DBR AQL VHU PNF OC+ KWZ SGY GQF AWO VNI SER MKC JBU LX+ HTZ PDY VTL SKF PBO JHX GWR DNC EQZ MAY IU+ PHC MWL GEU DTO AKX SQI JVY FR+ BNZ 27 golfers each play 13 rounds. Double resolution. ABCD EFGH IJKL MNOP AEIM BFJN CGKO DHLP AFKP BELO CHIN DGJM AGLN BHKM CEJP DFIO AHJO BGIP CFLM DEKN 16 golfers, foursomes, 5 rounds ABCD EFGH IJKL MNOP QRST AEIM BFJQ CGNR DKOS HLPT AFOT BELR CIPS DGJM HKNQ AJPR BHMS CEKT DFIN GLOQ ALNS BGIT CHJO DEPQ FKMR 20 golfers, foursomes, 5 rounds (best possible) ABKU IJSE QRCM DGFX HLNO PTVW ACLV IKTF QSDN EHGR BMOP JUWX ADMW ILUG QTEO FBHS CJNP KRVX AENX IMVH QUFP GCBT DJKO LRSW AFOR INWB QVGJ HDCU EKLP MSTX AEPS IOXC QWHK BEDV FJLM NRTU AHJT IPRD QXBL CFEW GKMN OSUV 24 golfers, foursomes, 7 rounds ABCD EFGH IJKL MNab cdef ghij klmn AEgk BFMc Ndhl GIem HJai CKbn DLfj AFjn BEae bfim HKcl GLMh CINk DJdg AIci BJNn EKMj FLdm begl CGaf DHhk AGbd BHgm ELNi achn FKfk CJej DIMl AKeh BLbk FIag EJfl Ncjm CHMd DGin AHNf BGjl FJbh Meik EIdn CLcg DKam ALal BKdi GJck Mfgn HIbj CEhm DFNe AJMm BIfh CFil DEbc GKNg HLen adjk 28 golfers, foursomes, 9 rounds ABCD EFGH IJKL MNPO abcd efgh ijkl mnop AEIm BgcH DFKp kPdf Maei ChbG jNoL lJnO Alof Bhkm DNGi FaLO MbHK CPeJ Ejcp gIdn AciL BjdK DkbJ FgoP fGOp CIla EhMn NeHm AgNK BElP DIoH hdiO beLp Cjfm FMcJ kaGn AhJp BFin DcmO INbf leGK CMod EgkL jPaH AFde BoGJ DEaf hlNc PiKm CHLn gjbO IkMp APbn BNap DglM koce fHiJ CEKO FhIj dGLm AjMG BIeO DhPL gaJm cfKn CFkN Eobi ldHp AkHO BMfL Djen Flbm IPcG Cgip ENdJ hoaK 32 golfers, foursomes, 10 rounds 36 golfers. 11 rounds is ok. This is a 4-RGDD of type 2^{18}.