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* The Aviva Stadium semi-final between Ulster Rugby and Edinburgh Rugby will be the sixth tournament match staged at the home of Irish Rugby since the redevelopment of Lansdowne Road. Last season Leinster Rugby beat Toulouse 32-23 in the semi-final at the stadium.
*ASM Clermont Auvergne's semi-final against Leinster will be the second French-Irish last four contest at Stade Chaban Delmas - Munster Rugby winning 31-25 against Toulouse at the Bordeaux stadium in 2000. The stadium also staged the 2004 semi-final when Toulouse beat Biarritz Olympique.
*No player has scored a hat-trick of tries in the 32 semi-finals played so far. Two players have scored braces, Christophe Juillet for Stade Francais Paris against Ulster Rugby at Ravenhill in the 1998/99 semi-finals and Paul Sackey for London Wasps in their Ricoh Arena last four meeting with Northampton Saints in the 2006/07 tournament.
*The 'six from six' jinx has struck again. Munster Rugby won all six of their Pool 1 matches but the quarter-final defeat by Ulster Rugby means that since the introduction of the home and away format in 1997/98 no club who had won all their Pool matches has gone on to make it nine from nine and lift the trophy.
*The 2008/09 semi-finals had the greatest combined attendance of 126,420 when the ties were played at Croke Park (Munster v Leinster, 82,208) and at the Millennium Stadium (Cardiff Blues v Leicester Tigers, 44,212).
*That Munster v Leinster attendance of 82,208 is the tournament semi-final record.
*Only one of the 32 semi-finals has failed to produce a try - Biarritz Olympique's 18-9 win over Bath Rugby in San Sebastian in 2006.
*The 32 Heineken Cup semi-finals have been watched by 1,004,580 fans - an average attendance of 31,393.
*Former Scottish referee Jim Fleming and Alain Rolland (Ireland) have controlled a record four Heineken Cup semi-8finals. Alan Lewis (Ireland), Chris White (England) and Nigel Owens (Wales) have each refereed three tournament semi-finals.
*The first semi-final to be decided on a penalty shoot out was Cardiff Blues against Leicester Tigers at the Millennium Stadium in 2009. When it was 26-26 and two tries each after extra time it needed penalties to separate the sides, Leicester going through to the Murrayfield final 7-6 on penalties.
*The first semi-final requiring extra time was the 1998 all-French clash between Toulouse and Brive, Toulouse losing that one on a 2-1 try count.
*The highest score in a semi-final has been the 37 points scored by Leicester Tigers against Toulouse in 1997 and the 37 points scored by London Wasps against Munster in 2004.
*The biggest winning margin has been 27 points, when Toulouse beat Swansea 30-3 in 1996.
*Two clubs have scored five tries in a semi-final, Leicester Tigers against Toulouse (1997) and Wasps against Munster (2004).
