Please read the following table in HTML format from a webpage and then answer the question in detail according to the table. Each table cell is defined by a <td> and a </td> tag. Each table row starts with a <tr> and ends with a </tr> tag. 'rowspan=m' and 'colspan=n' represents a cell spaning over 'm' rows and 'n' columns.

Webpage title:
Irish International Grand Prix
Table title:
Winners of the Irish International Grand Prix Races
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Year </th><th colspan=1 rowspan=1 > Circuit </th><th colspan=1 rowspan=1 > Race </th><th colspan=1 rowspan=1 > Driver </th><th colspan=1 rowspan=1 > Constructor </th></tr>
<tr> <th class="highlighted"  colspan=1 rowspan=3 > 1929 </th><td colspan=1 rowspan=3 > Phoenix Park </td><td class="highlighted"  colspan=1 rowspan=1 > Saorstát Cup </td><td class="highlighted"  colspan=1 rowspan=1 > Boris Ivanowski </td><td class="highlighted"  colspan=1 rowspan=1 > Alfa Romeo 6C </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > Éireann Cup </td><td class="highlighted"  colspan=1 rowspan=1 > Boris Ivanowski </td><td class="highlighted"  colspan=1 rowspan=1 > Alfa Romeo 6C </td></tr>
<tr> <td colspan=1 rowspan=1 > Irish Grand Prix </td><td colspan=1 rowspan=1 > Boris Ivanowski </td><td colspan=1 rowspan=1 > Alfa Romeo 6C </td></tr>
<tr> <th colspan=1 rowspan=3 > 1930 </th><td colspan=1 rowspan=3 > Phoenix Park </td><td colspan=1 rowspan=1 > Saorstát Cup </td><td colspan=1 rowspan=1 > Victor Gillow </td><td colspan=1 rowspan=1 > Riley 9 Brooklands </td></tr>
<tr> <td colspan=1 rowspan=1 > Éireann Cup </td><td colspan=1 rowspan=1 > Rudolf Caracciola </td><td colspan=1 rowspan=1 > Mercedes SSK </td></tr>
<tr> <td colspan=1 rowspan=1 > Irish Grand Prix </td><td colspan=1 rowspan=1 > Rudolf Caracciola </td><td colspan=1 rowspan=1 > Mercedes SSK </td></tr>
<tr> <th colspan=1 rowspan=3 > 1931 </th><td colspan=1 rowspan=3 > Phoenix Park </td><td colspan=1 rowspan=1 > Saorstát Cup </td><td colspan=1 rowspan=1 > Norman Black </td><td colspan=1 rowspan=1 > MG Midget </td></tr>
<tr> <td colspan=1 rowspan=1 > Éireann Cup </td><td colspan=1 rowspan=1 > Henry Birkin </td><td colspan=1 rowspan=1 > Alfa Romeo 8C </td></tr>
<tr> <td colspan=1 rowspan=1 > Irish Grand Prix </td><td colspan=1 rowspan=1 > Norman Black </td><td colspan=1 rowspan=1 > MG Midget </td></tr>
</table>
Question:
In 1929, what race did Boris Ivanowski compete in and who was the constructor?
Answer:
The first year of the Irish International Grand Prix event was 1929, when Boris Ivanowski raced and won both the Saorstát Cup and Éireann Cup races. He drove an Alfa Romeo to claim the inaugural Irish Grand Prix.