Leela

    Keywords: Software

Leela is a Go program by Gian-Carlo Pascutto, author of the strong chess program Sjeng. As of February 2008, the website states that Leela plays at the 4 kyu level on a 19x19 board, and at a high dan level on a 9x9 board.

The development version named LeelaBot? has attained a [ext] KGS rank of 1 kyu as of September 2008. A sample of [ext] recent games is available via KGS as well.

Website

[ext] http://www.sjeng.org/leela

Implementation

According to its web site, Leela is a mix of different approaches. It seems to use a Monte Carlo engine, because when it wins, it wins with 0.5 points.

Strengths

  • Like other Monte Carlo programs, it performs well against traditional Go programs.
  • Leela likes to make a large moyo in the center, which often compensates for the opponent having all four corners.
  • Leela often finds interesting moves that really annoy its opponent, and I'm not sure yet whether these moves are tesujis or aji keshi.
  • In the opening, Leela often plays a shoulder hit, even against a stone on a hoshi. After doing this in some corners, these stones form a large but loose center moyo. If the opponent misses the chance to invade, this moyo becomes the winning factor.
  • Especially in the opening, Leela often plays moves that single-digit kyus want to answer, for example attaching at weak stones or enclosing a group in a corner. This means that Leela can often control what's happening on the board.
  • At any point of time, Leela has a good estimate of counting points, which may even allow abandoning a large group.

Weaknesses

  • Leela likes to play long sequences of ataris. Against weaker players this often works, but stronger players can easily beat the engine by playing solidly.
  • Like GNU Go, its impression about the status of groups isn't always correct, and sometimes it just misses to save a large group from being killed.
  • If you're a single-digit kyu player, you may try taking all four corners and then destroying Leela's center moyo. Just take care that the moyo border doesn't become water-proof. This works well for me.

Comment

moved to Playing Monte Carlo Programs


This is a copy of the living page "Leela" at Sensei's Library.
(OC) 2012 the Authors, published under the OpenContent License V1.0.
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