Information:  - The Bulgarian Chess Championship is an event inaugurated in 1933 to crown the best chess player in Bulgaria. The championship has been held on a nearly annual basis since, with only a few years missed. In recent years some of the very best Bulgarian players have not participated in the championship, including former World Champions Veselin Topalov and Antoaneta Stefanova.  - Antoaneta Stefanova (born 19 April 1979) is a Bulgarian chess grandmaster and a former Women's World Champion.  - A board game is a tabletop game that involves counters or moved or placed on a pre-marked surface or "board", according to a set of rules. Some games are based on pure strategy, but many contain an element of chance; and some are purely chance, with no element of skill.  - Chess is a two-player strategy board game played on a chessboard, a checkered gameboard with 64 squares arranged in an eight-by-eight grid. Chess is played by millions of people worldwide, both amateurs and professionals.  - A chessboard is the type of checkerboard used in the classic board game chess, and consists of 64 squares (eight rows and eight columns) and 32 pieces. The squares are arranged in two alternating colors (light and dark). Wooden boards may use naturally light and dark brown woods, while plastic and vinyl boards often use brown or green for the dark squares and shades such as buff or cream for the light squares. Materials vary widely; while wooden boards are generally used in high-level games; vinyl, plastic, and cardboard are common for low-level and informal play. Decorative glass and marble boards are available but rarely accepted for games rated by national or international chess federations. Each square on the board has a name from a1 to h8.  - Aleksander Delchev ( Bulgarian :   ; born 15 July 1971 ) is a Bulgarian chess grandmaster and chess author . He won the Bulgarian Chess Championship in 1994 , 1996 and 2001 . He played for the Bulgarian national team in the Chess Olympiads of 1994 , 2000 , 2002 , 2004 , 2006 , 2008 , 2010 and 2012 with a performance of 64.6 % ( +36 = 34 - 12 ) . Selected tournament victories include the European Junior Chess Championship ( 1991 -- 1992 ) , the 47th Reggio Emilia chess tournament ( 2004 -- 2005 ) , the 4th Open Master at the Sixth International Chess Festival in Benidorm ( 2007 ) , the International Open Championship of Croatia ( 2007 ) and the Open International Bavarian Chess Championship in Bad Wiessee ( 2005 and 2013 ) . In 2011 he tied for 2nd - 7th with Julio Granda , Ivan Šari , Pablo Almagro Llamas , Maxim Turov and Mihail Marin at the 31st Villa de Benasque Open .  - Veselin Aleksandrov Topalov (pronounced  born 15 March 1975) is a Bulgarian chess grandmaster and former FIDE World Chess Champion.    After reading the paragraphs above, we are interested in knowing the entity with which 'aleksander delchev' exhibits the relationship of 'occupation'. Find the answer from the choices below.  Choices: - chess player  - game  - grandmaster
chess player
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Information:  - The ophicleide is a keyed brass instrument similar to the tuba. It is a conical-bore keyed instrument belonging to the bugle family and has a similar shape to the sudrophone.  - Brass is a metal alloy made of copper and zinc; the proportions of zinc and copper can be varied to create a range of brasses with varying properties. It is a substitutional alloy: atoms of the two constituents may replace each other within the same crystal structure.  - The subcontrabass tuba is an extension of the tuba family within the modern contrabass tuba . At least five known examples have been created , all pitched in BBBb , sounding a full octave lower than standard BBb contrabass tubas . Music for them is written in bass clef sounding a full octave lower than notated .  - The tuba is the largest and lowest-pitched musical instrument in the brass family. Like all brass instruments, sound is produced by moving air past the lips, causing them to vibrate or "buzz" into a large cupped mouthpiece. It first appeared in the mid 19th-century, making it one of the newer instruments in the modern orchestra and concert band. The tuba largely replaced the ophicleide. "Tuba" is Latin for 'trumpet'.  - A trumpet is a musical instrument commonly used in classical and jazz ensembles. The trumpet group contains the instruments with the highest register in the brass family. Trumpet-like instruments have historically been used as signaling devices in battle or hunting, with examples dating back to at least 1500 BC; they began to be used as musical instruments only in the late-14th or early 15th century. Trumpets are used in art music styles, for instance in orchestras, concert bands, and jazz ensembles, as well as in popular music. They are played by blowing air through almost-closed lips (called the player's embouchure), producing a "buzzing" sound that starts a standing wave vibration in the air column inside the instrument. Since the late 15th century they have primarily been constructed of brass tubing, usually bent twice into a rounded rectangular shape.   - Latin (Latin: ) is a classical language belonging to the Italic branch of the Indo-European languages. The Latin alphabet is derived from the Etruscan and Greek alphabets.  - A concert band, also called wind ensemble, symphonic band, wind symphony, wind orchestra, wind band, symphonic winds, symphony band, or symphonic wind ensemble, is a performing ensemble consisting of members of the woodwind, brass, and percussion families of instruments, along with the double bass.  - An orchestra is a large instrumental ensemble typical of classical music, which features string instruments such as violin, viola, cello and double bass, as well as brass, woodwinds, and percussion instruments, grouped in sections. Other instruments such as the piano and celesta may sometimes appear in a fifth keyboard section or may stand alone, as may the concert harp and, for performances of some modern compositions, electronic instruments.    After reading the paragraphs above, we are interested in knowing the entity with which 'subcontrabass tuba' exhibits the relationship of 'subclass of'. Find the answer from the choices below.  Choices: - alloy  - art  - art music  - bass  - battle  - brass  - brass instrument  - classical music  - concert  - concert band  - crystal  - family  - greek  - group  - jazz  - latin  - latin alphabet  - metal  - music  - musical instrument  - orchestra  - piano  - popular music  - sound  - standing wave  - structure  - trumpet  - violin  - wind
musical instrument
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