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sudo pacman -S gnugo  
resolving dependencies...
looking for conflicting packages...

Package (1)  New Version  Net Change  Download Size

core/gnugo   3.8-4          6,69 MiB       0,98 MiB

Total Download Size:   0,98 MiB
Total Installed Size:  6,69 MiB

:: Proceed with installation? [Y/n] 
:: Retrieving packages...
 gnugo-3.8-4-x86_64               998,9 KiB  4,24 MiB/s 00:00 [#################################] 100%
(1/1) checking keys in keyring                                [#################################] 100%
(1/1) checking package integrity                              [#################################] 100%
error: gnugo: signature from "Luca Giambonini <gluca86@gmail.com>" is unknown trust
:: File /var/cache/pacman/pkg/gnugo-3.8-4-x86_64.pkg.tar.xz is corrupted (invalid or corrupted package (PGP signature)).
Do you want to delete it? [Y/n] 
error: failed to commit transaction (invalid or corrupted package (PGP signature))
Errors occurred, no packages were upgraded.

$ pacman -Sii gnugo
Repository      : core
Name            : gnugo
Version         : 3.8-4
Description     : This sofware is a program that plays the game of Go
Architecture    : x86_64
URL             : http://www.gnu.org/software/gnugo/
Licenses        : GPL3  custom
Groups          : None
Provides        : None
Depends On      : ncurses  glibc  texinfo
Optional Deps   : None
Required By     : kigo
Optional For    : None
Conflicts With  : None
Replaces        : None
Download Size   : 998,88 KiB
Installed Size  : 6850,00 KiB
Packager        : almack <almack@chakralinux.org>
Build Date      : tis 3 jan 2017 00:27:05
MD5 Sum         : 5037869eae612b0b65f8f209727efab2
SHA-256 Sum     : 02f7c1ef3052d639b6c81dfa2566f6b6d7cf7bbd8b99e39b055f33cde0b3efdb
Signatures      : 88DE884F278A4200

This affects kigo, of #269.