Bb13b9 chord

Bb13b9 chord for piano presented by keyboard diagrams.
Explanation: The Bb13b9 alter the Bb13 by the change of one note. The B flat thirteenth flat ninth is a seven-note chord, but due to practical circumstances, one or more notes (the fifth primarily) are omitted. The chord name can also be written as Bb13(b9) or Bb13-9.
Theory: Compared to Bb13 the ninth tone in the chord is flattenedThe tone is one half step lower.

Bb13b9

Bb13b9 chord diagram
Notes: Bb - D - F - Ab - B - Eb - G

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Bb13#11 polychord

Explanation: The image below shows a polychord version of the Bb13#11. The chord is played in two parts with both hands.

Bb13#11 chord diagram
Polychord Bb7 (LH), C (RH)

Bb chord categories

Bb Bbm Bb7 Bbm7 Bbmaj7 BbmM7 Bb6 Bbm6 Bb6/9 Bb5 Bb9 Bbm9 Bbmaj9 Bb11 Bbm11 Bbmaj11 Bb13 Bbm13 Bbmaj13 Bbadd Bb7-5 Bb7+5 Bbsus Bbdim Bbdim7 Bbm7b5 Bbaug Bbaug7