  In the experiment with the SPHINX spectrometer in 1995-99 a new baryon state
X(2000) -> Sigma^0K^+ was observed in the proton diffractive reactions p + N(C)
-> Sigma^0K^+ + N(C). The main parameters of X(2000)^+ baryon are M = 1986 +- 6
MeV, Gamma = 98 +- 21 MeV. Unusual features of massive X(2000) state (narrow
decay width Gamma/M simeq 0.05, anomalously large branching ratio with strange
particle emission) make it serious candidate for cryptoexotic pentaquark baryon
with hidden strangeness. New data on the SPHINX with by an order of magnitude
enlarge statistics are in agreement with previous data and are supported our
conclusions. We propose further studies X(2000) baryon production in the meson
reactions with baryon exchange: pi^{+-} + p -> X(2000)^+ + pi^{+-} OZI -
forbidden suppressed reaction for the state |qqqsbar{s}>) and K^{+-} + p ->
X(2000)^+ + K^{+-} (OZI - allowed reaction). If the value of R=BR[pi^{+-} + p
-> X(2000)^+ + pi^{+-}]/BR[K^{+-}+p -> X(2000)^+ + K^{+-}]<<1 it will be the
crucial argument in favor of X(2000)= |qqqsbar{s}>) structure. These
experiments may be done on IHEP separated kaon beam with OKA spectrometer.
