protected function doOnePtCrossover(Chromosome $Chrom1, Chromosome $Chrom2) {

        $genesX = /* @var $Chrom1 Solution */ $Chrom1->genes;
        $genesY = /* @var $Chrom2 Solution */ $Chrom2->genes;

        $chromsLeftX = array();
        $chromsLeftY = array();

        $lPoint = mt_rand(1, $this->chromosomeDim - 2);
        $rPoint = $this->chromosomeDim - 1;
        for ($i = $lPoint; $i < $rPoint; ++$i){
            $tmpX       = $genesX[$i];
            $tmpY       = $genesY[$i];
            $genesX[$i] = $tmpY;
            $genesY[$i] = $tmpX;

            @$chromsLeftX[$tmpX] -= 1;
            @$chromsLeftX[$tmpY] += 1;
            @$chromsLeftY[$tmpY] -= 1;
            @$chromsLeftY[$tmpX] += 1;

        }
        //remove dulicates, satisfy demands
        $minIdxX     = $rPoint;
        $minIdxY     = $rPoint;
        $chromsLeftX = array_filter($chromsLeftX);
        $chromsLeftY = array_filter($chromsLeftY);
        arsort($chromsLeftX);
        arsort($chromsLeftY);
        for ($run = true, $i = 0; $run && $i <= $rPoint; ++$i) {
            $run = false;
            if(!empty($chromsLeftX)){
                $tmpX = $genesX[$i];
                if (isset($chromsLeftX[$tmpX]) && $chromsLeftX[$tmpX] > 0) {
                    end($chromsLeftX);
                    $genesX[$i] = ($key = key($chromsLeftX));
                    if (--$chromsLeftX[$tmpX] === 0) unset($chromsLeftX[$tmpX]);
                    if (++$chromsLeftX[$key]  === 0) unset($chromsLeftX[$key]);
                    if ($i < $minIdxX) $minIdxX = $i;
                }
                $run = true;
            }
            if(!empty($chromsLeftY)){
                $tmpY = $genesY[$i];
                if (isset($chromsLeftY[$tmpY]) && $chromsLeftY[$tmpY] > 0) {
                    end($chromsLeftY);
                    $genesY[$i] = ($key = key($chromsLeftY));

                    if (--$chromsLeftY[$tmpY] === 0) unset($chromsLeftY[$tmpY]);
                    if (++$chromsLeftY[$key]  === 0) unset($chromsLeftY[$key]);
                    if ($i < $minIdxY) $minIdxY = $i;
                }
                $run = true;
            }
        }

        $Chrom1->recalculateHighlyFitPatterns($minIdxX);
        $Chrom2->recalculateHighlyFitPatterns($minIdxY);
    }