| 28 Sep 19 | r01        | Southern KingsSouthern King | 27 - 31 | Cardiff BluesCardiff Blues |
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| 05 Oct 19 | r02        | Cardiff BluesCardiff Blues | 11 - 19 | EdinburghEdinburgh |
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| 12 Oct 19 | r03        | GlasgowGlasgow | 17 - 13 | Cardiff BluesCardiff Blues |
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| 25 Oct 19 | r04        | UlsterUlster | 23 - 14 | Cardiff BluesCardiff Blues |
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| 02 Nov 19 | r05        | Cardiff BluesCardiff Blues | 23 - 33 | MunsterMunster |
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| 09 Nov 19 | r06        | Cardiff BluesCardiff Blues | 30 - 17 | CheetahsCheetahs |
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| 30 Nov 19 | r07        | BenettonBenetton | 28 - 31 | Cardiff BluesCardiff Blues |
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| 21 Dec 19 | r08        | OspreysOspreys | 16 - 19 | Cardiff BluesCardiff Blues |
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| 26 Dec 19 | r09        | Cardiff BluesCardiff Blues | 16 - 12 | DragonsDragons |
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| 03 Jan 20 | r10        | Cardiff BluesCardiff Blues | 14 - 16 | ScarletsScarlets |
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| 15 Feb 20 | r11        | ConnachtConnacht | 29 - 0 | Cardiff BluesCardiff Blues |
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| 23 Feb 20 | r12        | Cardiff BluesCardiff Blues | 34 - 24 | BenettonBenetton |
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| 28 Feb 20 | r13        | EdinburghEdinburgh | 14 - 6 | Cardiff BluesCardiff Blues |
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| 21 Mar 20 | r14        | Cardiff BluesCardiff Blues | - | ZebreZebre |
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| 28 Mar 20 | r15        | Cardiff BluesCardiff Blues | - | OspreysOspreys |
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| 11 Apr 20 | r16        | MunsterMunster | - | Cardiff BluesCardiff Blues |
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| 18 Apr 20 | r17        | ScarletsScarlets | - | Cardiff BluesCardiff Blues |
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| 25 Apr 20 | r18        | Cardiff BluesCardiff Blues | - | Southern KingsSouthern King |
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| 08 May 20 | r19        | Cardiff BluesCardiff Blues | - | ConnachtConnacht |
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| 15 May 20 | r20        | LeinsterLeinster | - | Cardiff BluesCardiff Blues |
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| 29 May 20 | r21        | DragonsDragons | - | Cardiff BluesCardiff Blues |