Here is how you can easily win a game against a computer: you have to always keep the position locked,like Hikaru won in the game against rybka by keeping it locked,the game went like this:
1.g4d52.h3h53.g5g64.d4Bg75.Nc3c66.Nf3Bf57.Nh4e68.Nxf5exf59.Bf4Ne710.e3O-O11.Qd2Nd712.O-O-ORe813.Bg2Nf814.Be5Ne615.f4Nc816.Kb1Nd617.Bf1Qd718.a4b619.Ba6Nc720.Be2a621.Bd3b522.h4Ne623.Ne2Re724.Ka1Ree825.Qa5Nb726.Qd2Nd627.Rh2Bf828.Rf2Ng729.a5Nb730.Ng1Qd831.b4Qd732.Nf3Nd633.Bxd6Bxd634.Ne5Qb735.Kb2Rac836.c3Re737.Be2Ree838.Bf3Re739.Qc2Rd840.Rfd2Bb841.Be2Re642.Bd3Re743.Rf2Re644.Qd2Re745.Rg1Re646.Rff1Re747.Qd1Re648.Rg2Re749.Qc2Re650.Rfg1Re751.Rf2Re652.Qe2Re753.Qf3Re654.Rd2Re755.Rgd1Re656.Qg3Re757.Kb1Re658.Bc2Re759.Nd3Re660.Nc5Qc861.Nxe6Qxe662.Kb2Re863.Re1Qd764.Qf3Re765.Bd3Re866.Rg2Re767.Kb3Re868.Ra2Re769.Rc1Re870.Rca1Re771.Rg1Re872.Rh2Re773.Qg3Re874.Ka3Re775.Rb1Re876.Rd2Re777.Kb3Re878.Ra1Re779.Kb2Re880.Re2Re781.Ree1Re682.Qf3Qe783.Qf2Qe884.Be2Qe785.Bd1Qe886.Bf3Qe787.Qd2Qe888.Kb3Qe789.Kc2Qe890.Kb2Qe791.Rab1Kf892.Qf2Ke893.Be2Kd894.Bd3Qe895.Qf3Ke796.Kb3Kf897.Ra1Qe798.Bc2Kg899.Kb2Qe8100.Qf2Qe7101.Qd2Qe8102.Bd3Qe7103.Be2Qe8104.Rad1Qe7105.Rc1Qe8106.Bf3Qe7107.Qf2Qe8108.Rcd1Qe7109.Be2Re4110.Bd3Qe6111.Bxe4fxe4112.Ra1Nf5113.Kb3Kf8114.Rh1Ke8115.Rh2Kd7116.Qe1Kd8117.Rd1Kd7118.Rc2Kd8119.Qf2Nd6120.Ka2Qf5121.Rh1Kd7122.Qg3Ke6123.Qh3Ke7124.Qxf5Nxf5125.Rh3Ke6126.Kb3Bc7127.Re2Bb8128.Re1Bc7129.Ra1Bb8130.Rd1Bc7131.Re1Bb8132.Re2Bc7133.Rg2Bb8134.Rg1Bc7135.Rb1Bb8136.Rbh1Bc7137.Rg1Bb8138.Kb2Bc7139.Kc2Bb8140.Kd2Bc7141.Rh2Bb8142.Rc1Bc7143.Ra1Bb8144.Ke2Bc7145.Rg1Bb8146.Rhh1Bc7147.Kd2Bb8148.Rc1Bc7149.Rh3Bb8150.Ra1Bc7151.Rhh1Bb8152.Rae1Bc7153.Rh2Bb8154.Rh3Bc7155.Ra1Bb8156.Kc2Bc7157.Rf1Bb8158.Kb3Bc7159.Rf2Bb8160.Kc2Bc7161.Rg2Bb8162.Kd2Bc7163.Rh1Bb8164.Rf2Bc7165.Rfh2Bb8166.Rd1Bc7167.Rf1Bb8168.Re1Bc7169.Ke2Bb8170.Rh3Bc7171.Kd2Bb8172.Kc2Bc7173.Rb1Bb8174.c4dxc4175.Kb2Bd6176.Ka3Ne7177.Rb2Nd5178.Rg3Kf5179.Rb1Be7180.Rh3Bd6181.Kb2Be7182.Re1Bxb4183.Re2Bxa5184.Kc1Bb6185.Kc2a5186.Rh1a4187.Kc1a3188.Rc2Ba5189.Rh3Bb4190.Re2Bd6191.Re1b4192.Kb1b3193.Rh2c3194.Rc2Bb4195.Ka1bxc2196.Ka2Nxe3197.Kb3Kxf4198.Rc1c5199.dxc5Bxc5200.Rh1Kg3201.Ra1Kxh4202.Rc1Kxg5203.Rg1+Kf4204.Rh1g5205.Ra1h4206.Rc1h3207.Kxc3g4208.Kb3g3209.Ka4g2210.Kb5Bd4211.Ka6Bb2212.Ka7Bxc1213.Kb7Bb2214.Kb8h2215.Kb7f5216.Kb6Ke5217.Kc6f4218.Kb5f3219.Kb6a2220.Kb7f2221.Kc8f1=B222.Kb7g1=B223.Kb8h1=B224.Kb7c1=N225.Kc6a1=B226.Kd7Nd5227.Ke8Ne7228.Kxe7Nd3229.Kf7Nc5230.Ke7Nd7231.Kxd7e3232.Kd8e2233.Kc7e1=B234.Kd8Ba5+235.Ke8Bd8236.Kf8Be7+237.Kxe7Bb5238.Kf8Bd5239.Ke7Bb6240.Kf8Bd8241.Kg7Ba3242.Kh6Bf8+243.Kh5Bf7+244.Kg4Bf1245.Kg3Bd4246.Kg4Bf2247.Kf3Be1248.Kg4Bg6249.Kf3Bh5+250.Ke3Bh3251.Kd3Bg6+252.Kc4Bd7253.Kb3Bb5254.Ka2Bda5255.Kb2Bfb4256.Ka2Bec3257.Kb3Bbd3258.Ka4Bc2+259.Kb5Be8+260.Ka6Bc6261.Ka7Bd3262.Kb8Bdb5263.Kc8Kd6264.Kb8Bf6265.Kc8Kd5266.Kb8Bd6+267.Kc8Bd7+268.Kb7Bd4269.Ka8Bac7270.Kb7Bdb6271.Ka8Bbc6#0-1,now you understand that computers do not understand locked positions.Computers do not know everything,try looking at the simon williams lessons of computers going wrong by going for a premium membership on chess.com.