Since the two parties had not given their preference for the EVMs they would like to tamper with during the challenge, the Commission has brought to Delhi 14 machines -- from Ghaziabad and Gautam Buddha Nagar in UP, Patiala and Bhatinda from Punjab and Dehradun from Uttarakhand.
While each participating party can use a maximum of four EVMs for the challenge, sources in the commission said extra machines were also kept as back up keeping in mind any eventuality.
Members of a technical committee which helps the EC evaluate the EVMs would judge the proceedings.
Announcing the contours of the 'EVM challenge', the EC had said it has been divided into two parts. First, the parties will have to prove that the EVMs used in the assembly elections in the five states were tampered with to favour a particular candidate or political party by altering the results stored in them.
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They can use a combination of keys on EVMs or over the air communication devices such as cellphone and bluetooth to tamper with the machine to change the results, he said.
Under part two of the challenge, the participants will have to prove that the EVMs used in the assembly polls were manipulated before or on the poll day.
The participant would be considered to have "failed" the challenge if the EVM stops functioning due its inbuilt anti- tampering mechanism.
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