j"19HxigV4QyBv3tHpQVcUEQyq1pzZVdoAutL@27 : While adding certain offsets to a from square, to determine a destination square - a cheap 'and' by 0x88 is appropriate for an 'off the board' test:
text/plaintext twetch_twtext_1617449779317.txt|"1PuQa7K62MiKCtssSLKy1kh56WWU7MtUR5SET twdata_jsonnullurlnullcommentnullmb_user11711replynulltypepost timestampnullapptwetchinvoice$52a64975-f12e-4af5-8f96-39f70e00067d|"15PciHG22SNLQJXMoSUaWVi7WSqc7hCfva
BITCOIN_ECDSA"1LFT5EKxDgyWgcrUA9ehTp5gwCKP1ooJSKLXH+f95vo6DOQTw2Dbb3pDVjGQtnucVW5yHMLAG88/uOcnAou8rK2gI022SBrwC6EHxNjh+tJn0kZ4STvyXq9sCmg=
https://whatsonchain.com/tx/bf2ea9fa38c3dc28ff1443a1452941e75694da4e5841321d5e56faae97e6890b